Stretching effect: let the waist, chest, back muscle groups get more stretching and exercise, can exercise the whole body multiple muscle groups, arm muscle group, chest muscle group, abdominal muscle group, back muscle group, glute muscle group, lower limb muscle group Uniform force: scientific arc structure, uniform dispersion force, symmetrical design, multi-layer material, thickened load-bearing structure, more comfortable movement Strong spring: built-in strong spring, intelligent spring, comfortable and safe movement. Multi-layer material, noise reduction, anti-slip layer, reinforcement layer, damping layer, sound suppression layer, support layer Stand: Designed with mobile phone stand, you can exercise, follow instructional video reference, or relax by watching TV series, music, variety shows, movies, video calls