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A motorized treadmill runs its belt on a motor, so the main things to compare are the motor rating, the top speed, the incline range, the size of the running deck, the maximum user weight and how the frame folds for storage. Makers list these details differently, and some leave out items that matter to a buyer, so this comparison shows the figure each maker gives and writes Not stated where the maker’s page is silent.
Sunny Health & Fitness makes four of the five models here, and Marcy makes the fifth. The Sunny models differ mainly in incline design, speed and connectivity, while the Marcy model pairs a horsepower range with a folding design and a stated maximum user weight. For background on how these machines work, see Motorized Treadmills: How They Work and What to Check.
Every specification on this page comes from the manufacturer’s own product page, checked on 1 November 2026. We have not used these products ourselves, so the picks are based on published specifications only.
For the basics, read Motorized Treadmills: How They Work and What to Check, or compare folding options in Best Folding Treadmills for Home: 6 Models Compared.
How we chose these
- Motor and horsepower The motor rating shows how the belt is driven, though not every maker lists it.
- Top speed and incline These set how fast and how steep a workout can go on the machine.
- Deck size and user weight The running surface and the maximum user weight determine who can comfortably use the treadmill.
- Folding and storage A folding frame and wheels matter when the treadmill needs to stand out of the way.
Each figure comes from the maker’s own product page. Where a maker does not state a value, the table reads Not stated, so a missing number is not a sign of poor performance.
Comparison table
| Product | Motor | Top speed | Incline | Deck size | Maximum user weight | Folding |
|---|---|---|---|---|---|---|
| APEX 300 SMART | Not stated | Not stated | Not stated | Not stated | Not stated | Not stated |
| SF-T4400SMART | 2.2 horsepower | Up to 9 MPH | 3 manual incline settings | 49″ x 16″ | 285 LB | Soft drop folding |
| SF-T722062 | Not stated | Not stated | Not stated | 18.9″ deck as stated | Not stated | Not stated |
| JX-651BW | 1 to 2 horsepower | 0.5 to 8.0 mph | Not stated | 47.6″ x 16.1″ | 245 lb | Soft drop, stores flat or upright |
| SF-T7724SMART | Not stated | Up to 10 mph | 15 levels up to 12% | 18″ running deck | 275 lbs | Soft hydraulic drop with transport wheels |
Values are the figures each maker lists on its own product page. Not stated means the maker’s page gives no figure for that item.
1. Sunny Health & Fitness APEX 300 SMART Motorized Treadmill with Bluetooth: For shoppers who want a connected workout menu with heart rate sensing
Sunny Health & Fitness lists 20 built-in workouts for the APEX 300, along with room for custom sessions and countdown options. A Bluetooth and Wi-Fi link works with the SunnyFit app, and the maker mentions a 3-window LED display, a tablet holder, and heart monitor and pulse sensors.
- The maker lists 20 built-in programs and 3 user programs (Sunny Health & Fitness).
- Bluetooth and Wi-Fi connect to the SunnyFit app (Sunny Health & Fitness).
- Heart monitor and pulse sensors are included (Sunny Health & Fitness).
Pros: Large built-in program library; app connectivity; heart rate sensing listed by the maker
Cons: Motor, speed, incline, deck size and user weight are not stated by the maker
Check the Sunny Health & Fitness APEX 300 SMART Motorized Treadmill with Bluetooth on Amazon
2. Sunny Health & Fitness Smart Motorized Treadmill with Manual Incline SF-T4400SMART: For home walkers and runners who want listed speed and a manual incline
Sunny Health & Fitness presents the SF-T4400SMART as a home treadmill with a 2.2 horsepower motor and speeds up to 9 MPH. The maker lists a 49″ x 16″ cushioned surface, a soft drop folding mechanism and an emergency stop clip. It says the cushioned deck helps reduce joint impact.
- Nine pre-set programs and access to the SunnyFit app over Bluetooth (Sunny Health & Fitness).
- Maximum user weight listed at 285 LB (Sunny Health & Fitness).
- Emergency stop clip included, which the maker presents as a safety feature (Sunny Health & Fitness).
Pros: Motor and top speed both listed; 285 LB limit; emergency stop clip; soft drop folding
Cons: Incline is three manual settings and no incline degree is stated; console size is not stated
3. Sunny Health & Fitness Smart Motorized Treadmill with Handrails SF-T722062: For users who want extra handrail support and a low deck
Sunny Health & Fitness says the SF-T722062 has extended safety handrails and a wide, low deck of 18.9″. The maker pitches it for recovery routines and endurance sessions, and describes its shock absorption as advanced. Bluetooth links the treadmill to the SunnyFit app for tracking and routes.
- Extended safety handrails (Sunny Health & Fitness).
- Shock absorption described by the maker as advanced (Sunny Health & Fitness).
- Bluetooth connection to the SunnyFit app (Sunny Health & Fitness).
Pros: Extended handrails; low deck; app connection
Cons: Motor, speed, incline, user weight limit and folding are not stated by the maker
Check the Sunny Health & Fitness Smart Motorized Treadmill with Handrails SF-T722062 on Amazon
4. Marcy Easy Folding Motorized Treadmill | JX-651BW: For users who want a folding treadmill with preset programs and a listed speed range
Marcy describes the JX-651BW as an easy folding motorized treadmill with ten preset programs and three difficulty levels. Its LCD console shows speed, time, calories and distance. The maker lists a 1 to 2 horsepower motor with speeds from 0.5 to 8.0 mph, and says the unit can be stored flat or standing.
- Flip-up handles that can be raised out of the way for more intense runs (Marcy).
- Maker notes the unit is not meant for commercial settings (Marcy).
- Assembled dimensions listed as 64″L x 28″W x 54″H (Marcy).
Pros: Motor and speed range listed; stores flat or upright; ten preset programs; flip-up handles
Cons: Incline is not stated; top speed is 8.0 mph, the lowest listed here; the maker says it is not meant for commercial use
Check the Marcy Easy Folding Motorized Treadmill | JX-651BW on Amazon
5. Sunny Health & Fitness Energy Flex Motorized Auto Incline Smart Treadmill with Extra Shock Absorption: For users who want many incline levels and a higher listed top speed
Sunny Health & Fitness describes the Energy Flex with 15 incline levels up to 12% and an auto incline button. Top speed is listed as up to 10 mph, with an 18-inch running deck and a 275 lbs user limit. The maker says the treadmill carries UL certification and includes a clip and a textured belt for safety.
- 16 pre-set workouts and three customizable programs (Sunny Health & Fitness).
- Bluetooth sync to smart devices with access to over 1000 workouts (Sunny Health & Fitness).
- Soft hydraulic drop mechanism and transportation wheels for storage (Sunny Health & Fitness).
Pros: Auto incline button and 15 levels; top speed up to 10 mph listed; UL certification per the maker; transport wheels
Cons: Motor and horsepower are not stated by the maker; the speed range runs higher, which may suit runners but is not needed for walkers
Which one fits you
| Your situation | Look at | Why |
|---|---|---|
| You walk or run lightly at home | Top speed and motor | Marcy lists a 0.5 to 8.0 mph range; Sunny lists up to 9 MPH on the SF-T4400SMART and up to 10 mph on the Energy Flex. |
| You want to change incline during a workout | Incline settings | The Energy Flex lists 15 levels up to 12% with an auto incline button; the SF-T4400SMART lists three manual settings. |
| You need to store the treadmill in a small space | Folding design | Marcy, SF-T4400SMART and Energy Flex all list a folding design, and the Energy Flex adds transport wheels. |
| Heavier users want a higher weight limit | Maximum user weight | The SF-T4400SMART lists 285 LB, the Energy Flex 275 lbs and the Marcy 245 lb. |
Practical tips
- Check whether the maker lists a horsepower rating or only a speed range, since several listings here leave the motor blank.
- Match the maximum user weight to the person who will use the treadmill, and check the incline range if you plan hill-style workouts.
- Look at folding details if the treadmill must be moved out of the way between sessions.
FAQ
Does Sunny Health & Fitness list a motor for the APEX 300?
The maker’s page does not state a motor rating for the APEX 300, so compare it with models whose pages list one.
Which model here lists the highest top speed?
The Energy Flex SF-T7724SMART lists up to 10 mph, while the Marcy JX-651BW lists 8.0 mph as its top speed.
Which models list a folding design?
The Marcy JX-651BW, the SF-T4400SMART and the Energy Flex SF-T7724SMART list folding features. The APEX 300 and SF-T722062 pages do not state folding.
Sources
Specifications from each manufacturer’s product page, checked 1 November 2026: Sunny Health & Fitness APEX 300 SMART Motorized Treadmill with Bluetooth, Sunny Health & Fitness Smart Motorized Treadmill with Manual Incline SF-T4400SMART, Sunny Health & Fitness Smart Motorized Treadmill with Handrails SF-T722062, Marcy Easy Folding Motorized Treadmill | JX-651BW, Sunny Health & Fitness Energy Flex Motorized Auto Incline Smart Treadmill with Extra Shock Absorption. Makers can change specifications; check the product page before you buy.
