Practice method: First, lie on the ground with your heels together, slowly raise your head to find your ass, send your chest and waist out, and feel the tension of your waist muscles without the strong support of your arms.

It is necessary to practice the flexibility of the waist in dancing. The dancer's soft opening does not refer to the general softness and hardness, but mainly refers to the range of activities of each joint of the actor's body. There are many factors that determine the range of motion (soft opening) of human joints. The first thing to look at is the shape of the articular surface at the joint between bones. As we know, the shoulder joint can do multi-directional and wide-ranging activities, which is due to the large articular surface of the humeral head. The glenoid of the scapula is very small, which produces this result. However, due to the structural differences between the hip joint and the shoulder joint, the femoral head is deeply embedded in the acetabulum, and the ligaments are tense and powerful, which limits his range of motion, so he is far less flexible than the shoulder joint, which is normal for ordinary people. On the one hand, the shape of each articular surface is influenced by nutrient supply and absorption; On the one hand, it is determined by the conditions of long-term joint movement, and the range of joint movement can be increased through long-term training. On the other hand, if the joint is inactive for a long time, it is prone to stiffness and even loss of mobility. Excessive, excessive and improper methods will cause harm and even leave lifelong regrets for students. Therefore, it is very important to grasp the opportunity and grasp the scale of training.