If you lift your legs up while lying down, they can suddenly jump on top of you and hit nearby objects, so be careful with your free limbs. Whether turning or pushing, the neck rotates well side to side. The skeleton of other parts is more difficult to bend because it is too tight. The feeling of use is the best, because there is a tapper, it is easy to move even while standing, and the back is tight, so if you are used to the front, the back may be addictive.