1---Adjustable Elbow Support: This ab roller wheel features multiple horizontal and vertical adjustments to ensure the best exercise state for you. Addition, you can remove the elbow brace if you want to advanced exercise. 2---Automatic Rebound Design: The built-in brake function and spring-assisted rebound provide a smoother motion and greater resistance, keeping your muscles safe and reducing the risk of exercise-related injuries, providing an effective workout for your abs. 3---Stable Dual Wheels: The ab roller contains two spring wheels, offering greater stability and reducing the risk of slipping during exercise. The wide wheel spacing and a contact area of 10cm provide greater balance and less lateral shaking, making it perfect for beginners. 4---Convenient Timer & Phone Holder: The built-in intelligent timer to help you accurately record the length of exercise. The phone holder allows you to keep track of your exercise progress and keep your phone in sight while exercising. This is especially convenient for tracking time, reps, and other metrics. 5---High-Quality Materials: This abdominal roller features a comfortable foam grip and thick elbow pads for superior comfort, sweat absorption, and non-slip performance. This ab roller wheel is designed to target multiple muscle groups including arm muscles, chest muscles, back muscles, glutes, and leg muscles. Features: Material: ABS + rubber + steel pipe Product size: 22.5*24*39cm Colour: Blue, Orange Weight: 1580g Product list: 1*Rebound Abdominal Wheel+1*Kneeling mat