[Firm and Stable] The triangular structure is stable and will not shake or deform. Ergonomically designed to help you relax muscles that are too tight after exercise. [Portable Folding] Compared with the heavier plank, it uses lighter materials, but it will not reduce the quality. It is easy to carry and fold. You can take it home or the gym. [Anti-slip Design] There is a raised anti-slip design on the surface of the Adjustable Incline Boards to ensure that you will not slip and get injured during use. [5 Angle Adjustment ] The inclined plate used to stretch the lower leg has four adjustable angles: 15 , 25, 35 , 45 and 55 . You can adjust the gear according to different needs. The 4 angle adjustments on the inclined plate for calf extension help your muscles relax after exercise, help you stretch correctly and reduce the chance of injury. [Reduce Foot and Heel Pain] reduce foot pain caused by plantar fasciitis, heel tendinitis, ankle strain, arch pain and other chronic diseases. The human inclined board on the toes is helpful to correct foot posture and effective stretching. This calf stretching board also helps restore X-legs, O-legs, etc.