LifeSpan TR4000i Folding Treadmill Review

When I was considering a treadmill to replace for my Horizon Elite T9 after it was broken, I was suggested to choose the LifeSpan Fitness TR4000i Folding Treadmill as one of the best treadmills for runners under $2000. Up to now, I have been always satisfied with my decision. And this article will take a detailed look at everything to help you decide whether LifeSpan TR4000i Folding Treadmill is the best choice for your home gym.

LifeSpan Fitness TR4000i Description


The TR4000I is designed with a 3.25 HP horsepower continuous-duty DC motor. It is powerful enough to help you unlock high performance workout sessions. This motor is rated to be able to withstand every type of training sessions without meeting breakdowns. Its durability is ensured by a lifetime warranty.


The treadmill offers speed range from 0.5 to 12 MPH. These speeds are perfect for those who love doing their workout exercises at high speeds. And with this speed range the runner will be able to do intensive workout sessions to boost their performance remarkably.


Like the Horizon Elite T9, it can incline from 0 (flat) to a 15% which makes you feel like you are running or walking on a steep hill. Therefore, this is the treadmill that you need to lose more calories and build up your muscles.

Running surface

Its 20″ (W) by 60″ (L) running surface is especially spacious and also 4 inches longer than surface of the TR3000i. This is possibly the largest one among non-commercial treadmills. The large running area makes sure shorter or even taller users (6ft+) have enough room to workout with the most natural running stride.

Display console

Despite a much simpler and smaller size than many treadmills, the display console of LifeSpan Fitness TR4000i still provides useful features for easy use, including the Pause button, Enter, Reset, Arrows and Handlebar Control Buttons, Quick Select Buttons and Program Buttons. Its multicolored LCD console allows users to track their important workout information clearly. Besides, it also includes extra features such as a MP3 connection, headphone socket and an USB port.

Intelli-Step and Intelli-Guard

Intelli-Step is a great feature for those who are interested in a step count program. This feature will recognize the resistance on the running surface every time you put your foot down. In others word, this is a useful way to know how many steps you take every workout.

Intelli-Guard is another innovative feature coming with the LifeSpan Fitness TR4000i. Rather than tracking or improving your fitness, this is a safety feature that helps protect users from accident or injury by automatically stopping the treadmill belt when nobody is using the treadmill.

Workout programs

It offers a variety of preset training programs including 21 workout programs. They are divided into the following 5 categories: healthy living, sports training, heart rate control, weight management, and user defined. Most of these workouts are quite motivational. If you like creating your own workouts to fit your specific fitness needs, you can access the User Setup programs and set the time, speed, weight and incline for each segment, then press enter.

Heart rate monitor

You can either check your heart rate by using the chest strap or grasping the contact heart rate sensors for about 10 seconds. However, you have to order wireless chest straps separately.

Product weigh and dimensions:

It weighs 235 and has a footprint at 35" (W) x 52" (H) x 79" (D)

LifeSpan Fitness TR4000i Folding Treadmill Review

LifeSpan Fitness TR4000i Treadmill


Firstly, this model provides me with the same spacious running surface as one on my old Horizon Elite T9. So I could run and stretch my strides comfortably without worrying about falling out of the machine. Especially, this treadmill is designed with the 2-ply track reinforced by 8 shock absorbers. It offers sufficient cushioning to give the users the maximum comfortable strides during their training sessions.

For entertainment, a MP3 connection feature combining with a headphone socket lets me enjoy my favorite music while running. That is as a great motivation to promote me during tough programs. In addition, it has a tablet holder to create a convenient place for me to store my mobile accessories. This design also keeps me entertained with my desirable music videos or movies while doing exercise.

Lastly, I love a 3-speed cooling fan included that keeps me comfortable and cool to last my workouts longer.


Despite the narrower running surface than the Sole Fitness F85, the coarse-textured, 2.8mm updated thick orthopedic belt featured on this machine still offers not only cushioning, support but also an excellent running traction. This combines with the powerful motor to engage the user in injury-free and consistent workouts. There are several useful features built into the hand rails such as the quick change buttons and heart rate hand sensors. They make the speed or incline adjustments more simply and help reduce the need to use the display console.

Another supportive feature that I really like on the TR4000i is USB port that you can use to charge your mobile devices while running. Besides, it is compatible with the online health management system called Interactive Health Partner to help you manage your fitness and health outcome.


Fortunately, it is so easy to assemble with clear instructions provided by manufacture. It only took me less than 30 minutes for assembling. In the terms of convenience, the unit comes with an EZ Drop folding design. This feature helps lower the treadmill deck to the ground lightly and allows me to easily move my machine around.

Additionally, I can easily track my important workout data including speed, distance, heart rate, time, and even the number of steps I had taken due to the ‘Intelli-Step’ feature through the clear LCD screen. Besides, you can get workout tracking via the LifeSpan Bluetooth adapter. There are also 2 cup holders to keep you hydrated during workouts so you don’t have to get off the machine to drink water.


First off, the treadmill operates very strongly as other commercial treadmills would do. The powerful motor and the deck operate continuously without being interrupted or creating noise distractions. This advantage gives you a quiet environment to get entertained from your MP3 device or the TV. Moreover, the sturdy frame can support users weighing up to 350 LBS. I am a heavy runner but still feel this machine works very stably without any vibration or shaking even at high speeds.

Quality and durability

When it comes to the quality or durability, this machine is built up with aluminum side rails and a 1-inch reversible, commercial-grade deck that offer long-lasting durability. The frame is also made of premium quality steel that can withstand high intensive workouts and heavy users. Plus, as I mentioned above this model has the 2-ply track reinforced by 8 shock absorbers that also contributes to enhancing the durability of the machine too.

The electronics and control panel seem to be solid much more than lower-end models with flimsy and cheap plastic housings. And in order to confirm the high quality of the machine, LifeSpan offers a lifetime warranty on its motor and frame, 5 years on parts and 1 year on labor. After over 11 months of use, I have noticed no problem but good things.


This treadmill provides a long-lasting durability combining with the toughness and strength that meet the demands of serious home users. In others word, it seems to be the great choice of many serious runners or triathlon athlete. If you are not serious runners, it is also a great product for managing your weight, toning up, and improving your cardiovascular health right at your home.

LifeSpan Fitness TR4000i Folding Treadmill- Pros & Cons


  • LifeSpan Fitness provides step by step instructions for easy assembling their machine
  • The motor is stronger than most treadmills
  • Although this treadmill has a large size, it doesn’t take up a lot of space thanks to a useful folding mechanism.
  • It also comes with some entertainment options
  • The running belt moves smoothly and quietly
  • It provides much more preset programs compared to the competition
  • High quality belt cushioning system helps decrease impact on user’s knees


  • This model lacks of cooling fans which is often found on other treadmills at the same price range.
  • The price is slightly high
  • The smaller display screen makes setting up workout programs more difficult.
  • If you finish your workout with the belt at an incline, it won’t return to a flat position


The LifeSpan Fitness TR4000i Folding Treadmill is worth the money I paid for it. This machine is strong, stable, has high quality, and includes valuable features, workout diversity and accurate feedback. I have never been satisfied with my decision like when deciding to purchase this treadmill. How great it is!

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Compare LifeSpan TR4000i Folding Treadmill to other models

Sole Fitness F85

The first model I want to make the comparison with the TR4000i is Sole Fitness F85. This is also considered as one of the best treadmill at the price around $2000. These models have some similar features such as a 12 MPH top speed, 0 to 15% incline range. But generally, the F85 seems to have many better features including a more powerful motor (4.0 HP), higher weight capacity (400lbs).

The running surface on the Sole Fitness F85 is wider 2 inches than the one on the TR4000i. This is equipped with CushionFlex Whisper Deck technology that can decrease joint impact up to 40% compared to running on outdoor surfaces. However, while the F85 only gives you 10 workout programs, the TR4000i provides 21 preset programs which are designed to support you achieve your fitness goals easily. Both these machines are great options for serious runners.

Horizon Elite T9 Treadmill

Secondly, I would like to compare it to my old machine is Horizon Elite T9 Treadmill. Both models bring me very comfortable strides thanks to a spacious running surface (60" x 20"). However, Horizon Elite T9 has a less powerful motor than the TR4000i Folding Treadmill. It also offers a top speed up to 12 MPH which is suitable for even heavy running.

Like the LifeSpan treadmill, this model comes with a 0 - 15% incline range as well as 350 LBS weight capacity. In the terms of quality, I think the LifeSpan TR4000i has higher quality compared to the Horizon Elite T9. However, I still like great features of the Horizon treadmill that aren’t found on the TR4000i such as ViaFit Connect, Free Polar® chest strap, 44 workout programs or variable response cushioning. In short, each model has its own strong points and both them are great treadmills.

LifeSpan TR3000i Folding Treadmill

The last model in the list of treadmills compared to the TR4000i is TR3000i which is also a great model produced by LifeSpan. If you don’t have enough money to purchase TR4000i, this is a good recommendation. When it comes to main specs, this model only comes with 2.75 HP motor, a 20" x 56" running surface. These specs are lower than ones of the TR4000i but the machine still offers 12 MPH top speed, 0 - 15% incline range and 350 LBS weight capacity. These make the TR3000i one of the good choices for serious runners.

Overall, the TR4000i is considered as a greatly updated model of the TR3000i. 

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