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Recommended for those who tend to get stiff thighs and calves. Leaving it hard may lead to lower back injuries. The calves feel good by slipping on the board and stretching and loosening hard muscles on the back of the body such as the lower leg and thighs, eliminating muscle tension and allowing you to stretch the right amount of stretch. The angle can be adjusted according to the level. Recommended for those who want to stretch easily.