Flexibility is a comprehensive ability through all-round movement. Flexibility training (stretching) helps to balance the muscle groups that are overused in exercise or sports activities or because of bad posture. A clear understanding of the importance of many benefits stems from good procedural flexibility. Improved physical properties and reduced risk of injury. First of all, a safe and effective flexibility training program can improve physical fitness. Flexible joints have the ability to move in a wider range, require less energy and greatly reduce the risk of injury. Most professionals believe that stretching is in the organizational structure; Reduce the resistance, therefore, it is unlikely to be exceeded by the ductility of the injured tissue (the maximum range of the tissue during the activity). Reduce muscle soreness and improve posture. Recent research shows that slow and static stretching helps to reduce muscle soreness after exercise. Static stretching is a slow, gradual and controlled muscle stretching in the most comfortable posture 15-30 seconds through all-round movement. Stretching can also improve muscle balance and posture. Many people's soft tissue structures are not adapted to the influence of gravity or bad posture habits. Stretching can help to adjust the soft tissue structure, thus reducing efforts to achieve and maintain good posture in daily activities.