note:
1, shoulder joint. Pay attention to moving your shoulders when warming up. Warm-up should be based on the principle of step by step, and gradually increase the movements from small to slow. Don't use too much force when doing the action around the shoulder; Pay attention to the back muscles (that is, the muscles on the back butterfly bone) when doing the shoulder delivery, which greatly relieves the pressure on the shoulders.
2. Knee joint. The meniscus of the knee joint is the most fragile. Before doing exercises, it is suggested that you can do a soothing squat first, and then do a soothing squat. You can practice after your knees are adapted to the active state.
3, the spine. Special attention should be paid to: ① hip lifting when doing round hip posterior position; ② Use lumbar vertebrae to do explosive force when doing chest lifting. Both of these practices are very dangerous.