Front thigh and hip joint. This action requires the left leg to lunge, the right leg to keep the knee joint fixed, and feel the stretching of the front thigh and hip joint. At the same time, the arms are vertically close to the ears, the palms are opposite, and the waist and abdomen are steadily tightened. You can move your left hand to the rear and your right hand against your left knee to fully stretch your side chain muscles.