Automatic Rebound Abdominal Wheel : The abs roller features two-way automatic rebound technology that generates resistance when pushing forward or backward. Beginners can easily control the roller as it generates power when pulling back. Ergonomic Design : The abdomen wheel adopts a four -wheel design , increasing the wheel distance, expanding the contact area with the ground, effectively reducing the roll, and enhancing the stability during exercise. Multifunctional Exercise & Fitness Equipment : In addition to supporting abs workouts, this ab roller machine can be used for various exercises like ab tuck, ab roller, lower body exercise, bridge, plank, and more. It offers versatility and allows for a full-body workout.