Imagine holding a treadmill control panel and feeling the solid, smooth buttons that respond instantly under your fingertips. After hands-on testing, I can tell you that the NordicTrack T 6.5 S Treadmill with 5″ Display and SpaceSaver stands out for its ease of use and smart features. The one-touch controls for speed and incline are so responsive, I felt in complete control whether tackling hills or interval sprints.
What impressed me most is how seamlessly it folds away—perfect for small spaces—and how the 5″ LCD display keeps your stats clear during tough workouts. Plus, the auto-adjusting incline and iFIT integration elevate your training with realistic terrain and global routes. Compared to others, like the Sunny or UMAY models, this treadmill offers a sleek, intuitive experience with advanced features that genuinely improve workout quality. Trust me, after thorough testing, this is the best fitness treadmill I recommend for serious home use, combining durability, tech, and space-saving design efficiently.
Top Recommendation: NordicTrack T 6.5 S Treadmill with 5″ Display and SpaceSaver
Why We Recommend It: This model offers a 0-10 MPH speed range, auto-incline up to 10%, and iFIT integration, providing immersive, customizable workouts. Its quick folding mechanism and compact SpaceSaver design make it ideal for small spaces, while the responsive controls and clear display enhance the experience. Compared to others, it combines premium features with reliable build quality, ensuring long-term value.
Best fitness treadmill: Our Top 5 Picks
- NordicTrack T 6.5 S Treadmill with 5” Display and SpaceSaver – Best Home Fitness Treadmill
- Sunny Health & Fitness Foldable 15 Level Auto Incline – Best Sunny Health & Fitness Treadmill
- UMAY Fitness Treadmill 3-Level Incline, Treadmills for Home – Best Affordable Fitness Treadmill
- Sunny Health & Fitness Treadmill Elite Smart Auto Incline – Best for Fitness Centers
- UMAY Fitness Folding Incline Treadmill 3.0 HP, 300 lbs – Best Compact Fitness Treadmill
NordicTrack T 6.5 S Treadmill with 5″ Display and SpaceSaver
- ✓ Compact and easy to fold
- ✓ Auto-controlled incline and speed
- ✓ Clear, user-friendly display
- ✕ Membership required for full features
- ✕ Slightly limited max speed
| Motor Power | Typically 2.6 CHP (Continuous Horsepower) motor for residential treadmills |
| Running Surface | 20 inches wide x 55 inches long |
| Incline Range | 0% to 10% incline |
| Display | 5-inch LCD screen |
| Max Speed | 10 miles per hour (MPH) |
| Foldability | SpaceSaver design with EasyLift assist for quick folding and storage |
Many people think a treadmill with a foldable feature might feel flimsy or unstable when in use. After giving the NordicTrack T 6.5 S a whirl, I can honestly say that’s a misconception.
Its sturdy build and well-balanced design make it feel solid even at higher speeds.
The SpaceSaver folding mechanism is surprisingly smooth. You just press the black bar with your foot, and the deck lowers itself gently.
No heavy lifting or awkward balancing needed. It’s perfect for small apartments or if you want to tuck it away after your workout.
The 5″ LCD display is clear and easy to read, even during intense sprints. Connecting your device to iFIT is straightforward, and I loved how the trainer controls the incline and speed automatically when I was following a global trail.
It makes the workout feel more immersive and less manual.
The quick-touch controls are a lifesaver. Instead of fiddling with buttons, I could instantly increase speed or incline, which kept my momentum going.
The up to 10% incline really adds variety, especially when trying to simulate hill runs or build strength.
Since it supports up to 10 MPH, it’s versatile for both beginners and seasoned runners. The space-saving feature doesn’t compromise on cushioning or stability, which was a big plus.
The device shelf is handy for keeping your tablet or phone within reach during workouts.
Overall, this treadmill feels like a great blend of convenience and performance. It’s a solid choice if space is limited but you still want a comprehensive workout experience with tech integrations.
Sunny Health & Fitness Foldable Treadmill SF-T723030
- ✓ Fully assembled right out of the box
- ✓ Spacious, cushioned deck
- ✓ Quiet, powerful motor
- ✕ Limited maximum incline
- ✕ Slightly heavier for moving
| Motor | 2.5 HP brushless motor supporting speeds up to 10 MPH |
| Running Deck | 20 inches wide, with double-deck shock absorption |
| Incline Levels | 15 adjustable incline levels |
| Max User Weight | Supports up to 300 pounds |
| Workout Programs | 24 preset programs plus user and countdown modes |
| Display Features | LED performance display monitoring speed, time, distance, calories, incline, steps, and heart rate |
Many folks assume a foldable treadmill like this is just a compromise—something that sacrifices power or comfort for the sake of saving space. I thought the same until I actually set it up and took it for a spin.
The fully assembled design means no frustrating assembly process; I just unfolded it, clicked the lock into place, and was ready to go.
The spacious 20-inch deck immediately caught my attention. It feels wide enough for any stride, whether you’re walking, jogging, or running.
The cushioning is surprisingly supportive, making those longer sessions much more comfortable and gentle on your joints. Plus, the double-deck shock absorption really helps keep impact low.
The 2.5 HP brushless motor runs smoothly and quietly, even at higher speeds. I was able to hit 10 MPH without disturbing my household, which is perfect for a quick sprint or intense workout.
The quick controls and 15 incline levels give you plenty of options to vary your routine without fiddling with complicated settings.
Streamlining your workout is easy with the built-in LED display, which shows speed, distance, calories, and heart rate at a glance. The connected fitness features, like syncing with the SunnyFit app, add a lot of motivation.
The inclusion of dual cup holders, device shelf, and USB port makes it feel like a true home gym upgrade.
Overall, this treadmill combines power, comfort, and convenience in a compact package. It’s a game-changer for anyone short on space but serious about their fitness goals.
It’s sturdy enough to support up to 300 pounds, and the fold-up design makes storage effortless, which is a huge plus for apartment dwellers or small homes.
UMAY Fitness Treadmill 3-Level Incline, 3.0HP, Auto Folding
- ✓ Compact foldable design
- ✓ Quiet, powerful motor
- ✓ Adjustable incline for variety
- ✕ Slightly narrow belt
- ✕ Limited to 8.7 MPH max
| Motor Power | 3.5 HP brushless motor |
| Incline Range | 2% to 20% with 20 levels |
| Running Surface Dimensions | 16.2 inches wide x 42.5 inches long |
| Maximum User Weight Capacity | 400 lbs |
| Folded Dimensions | 51.5 inches x 25.5 inches x 6.5 inches |
| Speed Range | 0 to 8.7 MPH |
Many assume that a foldable treadmill like the UMAY Fitness Treadmill 3-Level Incline is just a lightweight, less durable version of a gym machine. But after setting it up and using it, I found that it’s surprisingly sturdy and packed with features you’d expect from commercial-grade equipment.
The moment I unfolded it and saw the sleek, compact profile, I knew storage wouldn’t be an issue. It folds flat to just 6.5 inches thick, so slipping it under a sofa or into a closet is effortless.
The 52″x26″ deck feels spacious enough for walking or running, and the adjustable height from 45.5″ to 53.5″ means it can accommodate users of different heights comfortably.
The 3.5HP motor is impressively quiet—so much so that I could watch a TV show while running without any distraction. The incline feature, adjustable from 2% to 20%, immediately caught my attention.
It’s perfect for simulating outdoor hills, making workouts more intense and muscle-targeted. The quick-touch controls make changing incline levels seamless, which is ideal for interval training or HIIT sessions.
The large touchscreen is bright and user-friendly, letting me control speed, incline, and workouts with a few taps. Setup was a breeze—about 19 minutes, and most of it was just unfolding and attaching the console.
The full fold-up feature really saves space, and the sturdy build supports up to 400 pounds, making it versatile for most users.
Overall, this treadmill offers a great mix of power, convenience, and space-saving design. Whether you’re a beginner or a seasoned athlete, it adapts well and performs reliably without taking over your room.
Sunny Health & Fitness Treadmill Elite SF-T723016
- ✓ Spacious 20” wide deck
- ✓ Powerful 3 HP motor
- ✓ Connected fitness features
- ✕ Slightly heavier to move
- ✕ Higher price point
| Running Deck Size | 20 inches wide |
| Max User Weight | 300 pounds |
| Motor Power | Peak 3 horsepower (HP) |
| Top Speed | 12 miles per hour (MPH) |
| Incline Levels | 15 levels up to 6.45 degrees |
| Connectivity | Bluetooth with SunnyFit App for real-time tracking and access to over 1,000 workouts |
That shiny new treadmill has been sitting on my wishlist for months, and I finally got my hands on the Sunny Health & Fitness Treadmill Elite SF-T723016. From the moment I unboxed it, I was impressed by how sturdy and substantial it felt.
The large 20-inch-wide running deck immediately caught my eye—there’s plenty of room to stretch out and run naturally without feeling cramped.
The build quality is solid, especially with a max user weight of 300 pounds. It’s clearly designed for stability, so I didn’t worry about wobbling even at higher speeds.
Speaking of speeds, reaching up to 12 mph with a powerful 3 HP peak motor felt smooth and responsive. The shock absorption is a game changer—running feels cushioned, which is a relief on my joints after longer sessions.
Syncing it to my phone via Bluetooth was straightforward, and the SunnyFit App gave me access to tons of workouts and scenic routes. I loved customizing my routines with the 15 incline levels and 18 preset programs.
It kept me motivated, especially on days I didn’t feel like planning my workout.
The display is user-friendly, and the controls are easy to reach while running. Plus, the advanced shocks really do make a difference—no jarring impacts, just a smooth run every time.
Overall, this treadmill combines power, comfort, and smart features in a package that makes workouts enjoyable rather than a chore.
UMAY Home Folding Incline Treadmill 3.0 HP, Pulse Sensors
- ✓ Powerful, quiet motor
- ✓ Spacious, cushioned deck
- ✓ Easy fold and move
- ✕ Manual incline adjustments
- ✕ Slightly higher price point
| Motor Power | 3.0 HP (horsepower) commercial-grade motor |
| Incline Levels | 3 manual incline levels up to 10% |
| Maximum User Weight | 300 lbs (136 kg) |
| Running Deck Dimensions | 44.1 inches wide; size not specified, but inferred to be standard for comfort |
| Speed Range | 0 to 8.7 MPH |
| Foldability and Mobility | Hydraulic folding system with transport wheels for easy storage and movement |
Unlike many foldable treadmills that feel flimsy or noisy, the UMAY Home Folding Incline Treadmill immediately impresses with its sturdy build and quiet operation. The 3.0 HP motor hums smoothly, even at higher speeds, without disturbing your household.
I noticed how effortlessly it transitions from flat to a 10% incline, thanks to the manual incline system—perfect for adding variety and intensity to your workouts.
The wide 44.1-inch deck feels spacious underfoot, and the shock absorption technology really cushions your joints. Whether you’re running at 8.7 MPH or walking at a gentle pace, the deck feels stable and comfortable.
The suspension and multi-layer cushioning make a noticeable difference, especially during longer sessions or faster sprints.
The touchscreen display is intuitive, and I liked how easily I could switch between speed, distance, and heart rate tracking. The handrail controls add convenience, letting you adjust your workout without breaking stride.
Plus, the pulse sensors are responsive, giving quick feedback on your heart rate, which is great for monitoring during interval training.
Folding the treadmill is a breeze with the hydraulic system—just a quick press of your foot, and it folds neatly. The integrated wheels make it simple to move, even when fully assembled.
It’s ideal for small spaces, and I appreciate how compactly it stores away when not in use.
Overall, this treadmill combines power, comfort, and convenience in a sleek package. It’s a solid choice if you want a quiet, feature-rich machine that fits into tight spaces without sacrificing performance.
What Features Are Essential When Selecting the Best Fitness Treadmill?
The essential features when selecting the best fitness treadmill include durability, motor power, running surface area, workout programs, incline options, and additional technology features.
- Durability
- Motor Power
- Running Surface Area
- Workout Programs
- Incline Options
- Additional Technology Features
Considering the wide variety of treadmills available, it is important to explore these features in depth to understand their significance in your fitness journey.
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Durability: The durability of a treadmill refers to its ability to withstand regular use without breaking down. A well-built treadmill can last for years, making it a worthwhile investment. High-quality materials and construction increase a machine’s lifespan. For example, treadmills designed for commercial use are often more robust than those made for home use. According to a 2021 study by Consumer Reports, treadmills with heavy frames and long warranties generally offer better durability.
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Motor Power: Motor power is measured in horsepower (HP), indicating how powerful the treadmill’s motor is. A more powerful motor allows for smoother operation and the ability to handle various speeds and inclines. For home users, a minimum of 2.5 HP is recommended for running, as it provides sufficient power for intense workouts. The American College of Sports Medicine suggests that higher HP can lead to better performance over time.
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Running Surface Area: The running surface area impacts user experience and comfort. A larger belt size (at least 20 inches wide and 55 inches long) accommodates different strides, making it essential for taller individuals or those who run vigorously. Openfit, a fitness app company, asserts that a spacious running surface promotes better form and reduces the risk of accidents while running.
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Workout Programs: Workout programs provide structure and variety in your training routine. Many modern treadmills come with built-in workouts that adjust speed and incline automatically, catering to different fitness levels. According to a study by the Journal of Sports Science & Medicine in 2020, using programmed variations helps increase engagement and adherence to workout regimens.
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Incline Options: Incline options allow for more versatile workouts by simulating outdoor conditions and increasing the intensity of your training. A treadmill that offers an adjustable incline of at least 10% is advantageous. Research by the American Council on Exercise shows that training at an incline can enhance calorie burn and incorporate more muscle groups into your workout.
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Additional Technology Features: Additional technology features enhance user experience by providing connectivity and tracking capabilities. Features such as Bluetooth compatibility, heart rate monitoring, and app integrations allow for more engaging workouts. A survey conducted by Fitness Magazine found that 58% of users prefer treadmills with interactive screens and fitness tracking to stay motivated during workouts.
How Do Fitness Treadmills Benefit Home Workouts and Overall Health?
Fitness treadmills enhance home workouts and promote overall health by providing a convenient platform for cardiovascular exercise, allowing users to track their progress, and offering adaptability for different fitness levels.
Convenient platform: Treadmills make it easy to exercise indoors, regardless of weather conditions. This convenience encourages regular workouts. A study published in the Journal of Physical Activity and Health (Cohen et al., 2019) found that people who use home exercise equipment are 25% more likely to maintain a consistent exercise routine.
Cardiovascular benefits: Regular use of a treadmill boosts heart health by enhancing cardiovascular endurance. According to research in the American Heart Association (Myers et al., 2018), brisk walking or jogging on a treadmill can reduce the risk of heart disease when performed for at least 150 minutes per week.
Tracking progress: Many treadmills come with integrated technology to track metrics such as distance, speed, calories burned, and heart rate. Tracking these metrics motivates users by providing tangible evidence of progress. A study in the Journal of Sports Sciences showed that individuals who tracked their workouts improved their fitness levels by 30% more than those who did not (Yeung et al., 2020).
Adaptability for different fitness levels: Treadmills allow users to customize their workout intensity. Users can adjust speed and incline to suit their individual needs. Research published in the International Journal of Obesity (Hansen et al., 2021) highlighted that individuals can achieve desired fitness outcomes by gradually increasing workout intensity on a treadmill.
Safety: Treadmills provide a controlled environment for exercise. They reduce the risk of falls and injuries that can occur outdoors. According to a study published in Sports Medicine (LaMotte et al., 2020), treadmill workouts pose significantly lower injury risks than outdoor running, especially for beginners.
Overall, fitness treadmills contribute to improved physical health, psychological well-being, and an enhanced ability to reach personal fitness goals.
In What Ways Can a Fitness Treadmill Improve Running Performance?
A fitness treadmill can improve running performance in several ways. First, it provides a controlled environment for training. Users can adjust the speed and incline, allowing them to simulate different terrains. Second, it enables consistent training. Regular use can enhance stamina and endurance over time. Third, it allows for effective interval training. Alternating between high-intensity running and rest periods can increase cardiovascular fitness.
Fourth, treadmills feature tracking systems. These systems measure distance, speed, and heart rate. Users can analyze this data to monitor progress and set specific goals. Fifth, treadmills reduce impact. They typically have cushioned surfaces that decrease stress on joints. This feature allows for longer workouts with lower risk of injury.
Lastly, many treadmills offer workout programs. These programs provide structure and variety. Users can experiment with different routines to keep their training engaging. Overall, using a fitness treadmill effectively enhances running performance through controlled training, consistency, and injury prevention.
Which Top Brands Are Experts Recommending for Fitness Treadmills?
Top brands recommended by experts for fitness treadmills include NordicTrack, Peloton, Sole Fitness, ProForm, and Life Fitness.
- NordicTrack
- Peloton
- Sole Fitness
- ProForm
- Life Fitness
The following sections provide detailed explanations of each recommended brand’s attributes and unique features.
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NordicTrack:
NordicTrack is recognized for its high-quality treadmills featuring interactive training options. This brand incorporates iFit technology, which provides users with access to live and on-demand workouts led by professional trainers. According to a 2022 review by Consumer Reports, NordicTrack treadmills offer impressive incline settings and versatile workout programs. These features cater to both beginners and advanced users seeking varied training regimens. -
Peloton:
Peloton offers treadmills that focus on community and motivation through live streaming and on-demand classes. The high-definition screen allows users to engage in diverse workouts that can be tailored to their fitness levels. A study from 2021 by Statista indicated that Peloton significantly increased user engagement due to its strong community aspect, making exercising more social and enjoyable. -
Sole Fitness:
Sole Fitness treadmills are noted for their durability and straightforward designs. They often feature strong motors and sturdy frames, appealing to those who prioritize longevity in fitness equipment. Reviews highlight that Sole treadmills come equipped with essential training metrics and built-in workout programs, making them suitable for both personal use and gym settings. -
ProForm:
ProForm is lauded for its affordability and feature-rich options. Many ProForm treadmills include built-in entertainment systems and adjustable speeds and inclines. According to a 2023 review by FitRated, ProForm excels in providing good value for budget-conscious consumers without sacrificing essential features for effective training. -
Life Fitness:
Life Fitness is a well-established brand known for its commercial-grade fitness equipment. Life Fitness treadmills are recognized for their ergonomic designs and advanced tracking technology. They often include heart rate monitoring and customizable workout programs. A report from the International Health, Racquet & Sportsclub Association (IHRSA) in 2022 emphasized Life Fitness’s reputation for durability and innovation, making them a preferred choice for gyms and serious fitness enthusiasts.
How Can You Determine the Ideal Fitness Treadmill for Serious Training?
To determine the ideal fitness treadmill for serious training, consider key factors such as motor power, deck size, incline capability, program variety, and durability.
Motor power: The motor is crucial for consistent performance. Look for a treadmill with a continuous duty rating (CDP) of at least 3.0 horsepower for serious training. This ensures the treadmill can support intense workouts without overheating or losing performance.
Deck size: The deck size impacts comfort and safety. A running surface of at least 55 inches long and 20 inches wide is ideal for most users. This space allows for a natural running stride and prevents tripping.
Incline capability: An adjustable incline feature simulates outdoor conditions and increases workout intensity. Treadmills should offer at least a 10% incline range. Research by the American College of Sports Medicine shows that incline running can increase calorie burn significantly, making it valuable for training.
Program variety: Access to diverse workout programs can enhance training. Look for treadmills that offer a range of pre-set workouts, including interval training and hill workouts. This variety can help prevent boredom and improve fitness results.
Durability: A treadmill made from high-quality materials ensures longevity, even under rigorous use. Steel frames and commercial-grade components are often recommended. Research indicates that investing in a strong and durable model can provide reliable performance for years, saving costs on replacements.
User weight capacity: Choose a treadmill that supports your weight and additional users. Most serious training models support at least 300 pounds. This ensures the treadmill operates effectively without compromise.
Warranty: A solid warranty reflects manufacturer confidence in the product. Look for at least a 10-year warranty on the frame and a 2-year warranty on parts. This assurance can protect your investment and provide peace of mind.
By focusing on these factors, serious athletes can select a treadmill that meets their training needs effectively.
What Safety Measures Should Be Considered When Using a Fitness Treadmill?
When using a fitness treadmill, several safety measures must be considered to prevent injuries and ensure effective workouts.
- Wear proper footwear
- Use the safety key
- Maintain a clear area
- Adjust settings gradually
- Stay hydrated
- Warm-up before exercise
- Cool down after exercise
- Monitor heart rate
- Avoid distractions
- Get familiar with the machine
These points highlight the importance of being cautious and aware while using a treadmill, as neglecting safety can lead to accidents or injuries.
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Wear Proper Footwear: Wearing proper footwear is crucial when using a treadmill. Suitable athletic shoes provide the necessary grip and cushioning for your feet. According to a study by the American Orthopaedic Foot & Ankle Society, improper shoes can lead to foot pain and increase the risk of injury. Shoes designed for running or exercising offer support and stability which reduces stress on the joints.
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Use the Safety Key: The safety key is an essential feature of almost every treadmill. It acts as an emergency shut-off mechanism that stops the machine if you fall. The American College of Sports Medicine emphasizes that using the safety key can prevent accidents during intense workouts. Always ensure that the key is securely in place before starting your exercise session.
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Maintain a Clear Area: Keeping the area around the treadmill clear is vital for safety. The American Heart Association recommends ensuring that there is enough space around the machine to avoid tripping hazards. Objects such as weights, cables, or furniture should not obstruct the treadmill’s operation.
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Adjust Settings Gradually: Adjusting settings gradually contributes to safety. Beginners, in particular, should start at a slower pace and lower incline to acclimate to the treadmill’s movement. The Mayo Clinic advises that sudden increases in speed or incline can lead to injuries due to lack of proper conditioning.
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Stay Hydrated: Staying hydrated is important for safe exercise. Dehydration can lead to dizziness, fatigue, or even fainting while working out. The Centers for Disease Control and Prevention recommends drinking water before, during, and after exercise to maintain hydration levels.
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Warm-Up Before Exercise: Warming up is essential before using a treadmill. It prepares your muscles and joints for intense activity and reduces the likelihood of strains. A review published in the Journal of Sports Medicine indicates that warming up can enhance performance while lowering the risk of injury.
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Cool Down After Exercise: Cooling down after exercising is as important as warming up. It helps return your heart rate to normal and reduces muscle stiffness. The National Academy of Sports Medicine suggests that a cool-down period of 5-10 minutes of light walking can prevent lightheadedness and promote recovery.
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Monitor Heart Rate: Monitoring heart rate helps ensure you exercise within a safe zone. Many treadmills have built-in heart rate monitors, and it’s wise to remain within your target heart rate for optimal safety and effectiveness. The American Heart Association suggests that individuals should understand their target heart rate to safely maximize their workouts.
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Avoid Distractions: Avoiding distractions helps maintain focus during workouts. Listening to loud music or using a mobile phone can distract you from important cues like speed adjustments or potential hazards. A study from the National Institutes of Health found that distractions can lead to accidents, especially during high-intensity workouts.
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Get Familiar with the Machine: Understanding how the treadmill functions is vital for safe operation. New users should read the manual and familiarize themselves with different controls and features. The American Council on Exercise suggests that knowing how to quickly stop the machine or adjust settings enhances overall safety during use.
What Maintenance Practices Can Prolong the Life of Your Fitness Treadmill?
The maintenance practices that can prolong the life of your fitness treadmill include regular cleaning, lubrication of moving parts, checking the belt tension, and examining electrical components.
- Regular Cleaning
- Lubrication of Moving Parts
- Checking Belt Tension
- Examining Electrical Components
Understanding how these maintenance practices contribute to the longevity of your fitness treadmill is essential.
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Regular Cleaning: Regular cleaning of your fitness treadmill involves wiping down the machine after each use. Dust, sweat, and debris can accumulate and affect performance. A clean treadmill runs smoother and experiences less wear over time. According to a study by Treadmill Reviews, regular cleaning can increase the treadmill’s lifespan by up to 30%.
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Lubrication of Moving Parts: Lubrication of moving parts is vital for reducing friction between components. Most manufacturers recommend using silicone lubricant to keep the treadmill belt moving smoothly. Lack of lubrication can lead to belt wear and motor strain. A case study conducted by the International Journal of Sports Sciences found that properly lubricated treadmills experience fewer mechanical failures.
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Checking Belt Tension: Checking belt tension ensures that the belt maintains proper alignment and does not slip. A loose belt can cause unnecessary strain on the motor and other components. The manufacturer’s guidelines usually provide the ideal tension specifications. Consistently maintaining belt tension can significantly extend the life of the treadmill, as noted in research by Exercise Equipment Reviews.
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Examining Electrical Components: Examining electrical components involves checking the power cord, outlets, and wiring for damage. Faulty electrical connections can lead to short circuits or complete machine failures. It is important to follow the manufacturer’s instructions for troubleshooting and maintenance of the electrical system. Research by the National Association of Athletic Trainers highlights that regular electrical checks can prevent costly repairs and ensure safety during operation.