1. 上台阶随人体重心前移自动背伸。
2. 下台阶自动背伸，使人体重心下沉，实现全脚掌支撑下台阶。
3. 下蹲自动背伸，实现双腿平衡下蹲，解决单脚支撑稳定性差，吃力等问题。
4. 跖屈与背伸双向调节，提供重心的平滑过渡，上下斜坡如履平地。
5. 双向压力可调。
6. 与膝关节形成联动效应。
1. When going up the stairs, the center of gravity of the human body moves forward, and the back is automatically stretched.
2. The step is automatically stretched back, so that the center of gravity of the human body sinks, and the whole foot supports the next step.
3. Squat automatic back extension to achieve balanced squatting of both legs, and solve the problems of poor stability and difficulty of one-foot support.
4. Two-way adjustment of plantar flexion and dorsal extension provides a smooth transition of the center of gravity, and the upper and lower slopes are like walking on the ground.
5. Two-way pressure adjustable.
6. Forming a linkage effect with the knee joint.