Set new fitness goals and break personal bests with the SF-T7723 Force Fitmill Treadmill by Sunny Strength™. This heavy-duty fitness training device provides everything needed for a maximum intensity workout and improved muscular power. The self-powered treadmill stands at a fixed incline of 13.5% promoting a more fluid running motion. The high-density handrails support multi-grip functioning which encourages a versatile yet challenging cardio session. The slip-resistant rails also mimic sled training which allows you to place your shoulders and push against the tread to develop acceleration strength. Increase up to an incredible 16 levels of magnetic tension for a workout proven to increase your performance during both hilly and flat terrain running courses. Dual flywheel structure work together to create a more stable and smooth response for the user. The weight of both flywheels requires a higher energy demand from the user to get the belt started. This can cause a greater metabolic demand or more calories. This is increased when you increase the resistance levels.