Thigh muscle atrophy can be squatted against the wall, side lying on the leg, prone after hooking the leg and other ways to exercise the front, inner and back side of the thigh muscles. 1. Squatting against the wall: stand with your back against the wall, separate your feet shoulder-width apart, then slowly squat down to the thighs parallel to the ground, and hold it. After this action is stabilized, the good side of the foot slowly raised off the ground, the power will be focused on the need to exercise that foot. This action can exercise the atrophied muscles of the front side of the thigh. 2. Lying on the side to lift the leg: lying on the bed or yoga mat, the injured foot under the good side of the foot flexion in front, the affected side of the inner thigh force, upward lift, the whole time to keep the abdomen. This action can exercise the atrophied muscles of the inner thigh. 3. Prone after hooking the leg: prone position posture, lying on the bed or yoga mat, exhale, the thighs of the back side of the force, the leg slowly and evenly hooked, keep 3 ~ 4 seconds; inhale, controlled calf slowly and evenly put back. This action can exercise the atrophied muscles on the back side of the thigh. If thigh muscle atrophy occurs, it should be under the guidance of a professional rehabilitator, according to the condition of the appropriate training methods, do not blindly exercise, so as not to cause unnecessary harm.