Important Safety Information
Please read this entire manual carefully before operating the treadmill. Keep this manual for future reference.
- Ensure the treadmill is placed on a flat, stable surface.
- Always connect the power cord to a properly grounded electrical outlet.
- The maximum user weight capacity for this treadmill is 300 lbs. Do not exceed this limit.
- Always attach the safety key to your clothing before starting the treadmill. Removing the safety key will immediately stop the machine.
- Keep children and pets away from the treadmill during operation.
- Wear appropriate athletic footwear. Avoid loose clothing that could get caught in the machine.
- If you experience dizziness, nausea, chest pain, or any other abnormal symptoms, stop your workout immediately and consult a physician.
- Caution: Be aware of the plastic edges at the rear of the running belt to avoid accidental contact, especially with feet or clothing.

Product Overview
The RHYTHM FUN Incline Foldable Treadmill (Model M4138) is designed for home and office use, offering a compact and versatile solution for walking, jogging, and light running. Its innovative design allows for easy storage without compromising on performance.
Key Features
- 3-Level Manual Incline: Adjustable from 1.5% to 8% for varied workout intensity.
- Powerful & Quiet Motor: Equipped with a 2.5 HP motor, providing speeds from 0.5 to 5 MPH with low noise (<65dB).
- Spacious Running Belt: Features a 36.6" x 15" 5-layer non-slip belt with shock-absorbing design for joint protection.
- Compact & Foldable: Designed for easy folding and storage under furniture, with built-in wheels for portability.
- Smart App Connectivity: Connects to the Ypoofit app via Bluetooth for course training, realistic running tracks, and comprehensive exercise data tracking (speed, calories, time, distance).
- Convenient Controls: Operable via console buttons and a remote control. Includes a phone/tablet holder with suction cups.


Setup Guide
The RHYTHM FUN Incline Foldable Treadmill comes largely pre-assembled. Follow these steps for quick setup:
- Unpack: Carefully remove the treadmill from its packaging, ensuring all protective materials and styrofoam are removed.
- Lift Handlebar: Gently lift the handlebar into the upright position until it clicks into place.
- Secure Handlebar: Locate the red fixing knobs on both sides of the handlebar base. Screw them in tightly to secure the handlebar firmly.
- Attach Phone/Tablet Holder: Mount the phone/tablet holder onto the designated area at the top of the handlebar. Ensure it is stable.
- Connect Power: Plug the power cord into the treadmill's power input and then into a grounded electrical outlet.
- Insert Safety Key: Place the red safety key into its designated slot on the console. The display will activate.


Operating Your Treadmill
Power On/Off
To power on the treadmill, ensure the power cord is connected and the safety key is in place. Flip the main power switch located at the base of the unit. The LED display will illuminate. To turn off, you can either flip the main power switch back or use the power button on the remote control.
Adjusting Speed
Speed can be adjusted using the '+' and '-' buttons on the console or via the remote control. The treadmill offers a speed range of 0.5 to 5 MPH (approximately 0.8 to 8.0 Km/Hour).
Using the Remote Control
The included remote control allows for convenient adjustment of speed and instant stop. Ensure the remote has working batteries. The remote duplicates the main console functions for ease of use.
Incline Adjustment
This treadmill features a manual 3-level incline, adjustable from 1.5% to 8%. To change the incline, locate the adjustment points at the base of the treadmill and secure the incline bolts into the desired position. Always ensure the treadmill is off and stable before adjusting the incline.
App Connectivity (Ypoofit)
Connect the treadmill to the Ypoofit app via Bluetooth to access course training, realistic running tracks, and comprehensive exercise data tracking including speed, calories burned, time, and distance. Download the Ypoofit app from your device's app store.


Maintenance Guidelines
Lubrication
Regular lubrication of the running belt is essential for optimal performance and longevity. The manufacturer recommends lubricating the belt every 125 miles of use. Use the provided treadmill lubricant by applying it under the belt as instructed in the manual. This helps reduce friction and wear.
Cleaning
Regularly wipe down the treadmill with a damp cloth to remove dust and sweat. Avoid using abrasive cleaners or harsh chemicals that could damage the surface.
Belt Adjustment
If the running belt becomes misaligned or loose, refer to the detailed instructions in the included user guide for proper adjustment using the provided Allen wrench. Correct belt tension and alignment are crucial for safe and efficient operation.

Troubleshooting Common Issues
| Issue | Possible Cause | Solution |
|---|---|---|
| Treadmill not turning on | Power cord not connected, main switch off, safety key not inserted | Check power connections, ensure main switch is on, insert safety key fully. |
| Running belt slipping | Belt needs lubrication, belt is loose | Lubricate the running belt, adjust belt tension (refer to detailed manual). |
| Unusual noise during operation | Loose parts, lack of lubrication, foreign object | Check for and tighten any loose screws, lubricate the belt, inspect for obstructions. |
| Display not working correctly | Power issue, loose connection, display malfunction | Verify power supply, ensure all connections are secure, restart the treadmill. |
For issues not listed above, please refer to the full user manual or contact customer support for further assistance.
Product Specifications
| Attribute | Value |
|---|---|
| Brand | RHYTHM FUN |
| Model Name | M4138 |
| Color | Black with Incline |
| Product Dimensions | 45.5"D x 24.4"W x 42"H |
| Item Weight | 43 Pounds |
| Material | Alloy Steel |
| Maximum Speed | 5 Miles per Hour |
| Minimum Speed | 0.5 Miles per Hour |
| Maximum Horsepower | 2.5 Horsepower |
| Maximum Incline Percentage | 8.00 |
| Deck Length | 37 Inches |
| Deck Width | 15 Inches |
| Maximum Weight Recommendation | 300 Pounds |
| Special Feature | Portable, Manual Incline, Foldable |
| Display Type | LED |
| Connectivity Technology | Bluetooth |
| Included Components | Safety Key |
| Metrics Measured | Speed, Calories Burned, Time, Distance |
| Assembly Required | Yes |
| UPC | 767461133400 |
Warranty and Customer Support
Warranty Information
The RHYTHM FUN Incline Foldable Treadmill comes with a 1-year warranty. Please retain your proof of purchase for all warranty claims and inquiries.
Customer Support
For any questions, setup assistance, troubleshooting, or after-sales service, please contact the RHYTHM FUN customer support team. They are dedicated to providing high-quality support and ensuring your satisfaction.





