Lying down with feet raised, if applied to soft tissue injuries or even fractures of the lower limbs, has the effect of promoting blood circulation in the lower limbs as well as lymphatic reflux, thus reducing localized swelling and pain. In addition, if the legs are lifted up in the air can also exercise the muscles of the bilateral thighs, as well as exercise the muscles of the lower abdomen, because the two movements if the suspension, the thigh quadriceps or the front side of the hip joint muscles, as well as the abdominal muscles of the lower abdomen must be forcefully contracted, and some of the exercise of the lower abdominal muscles of the crowd also often do the action, exercise the lower abdominal muscles. In addition to exercising the lower abdominal muscles, it can also reduce the accumulation of fat in the lower abdomen and achieve the role of weight loss.