The tendon is composed of collagen fibers, which do not have the ability to contract, and its role is to transmit the contraction force of the muscle to the bone tissue. The tendon fibers are corrugated at rest and disappear when stretched. Microdamage to the collagen fibers can occur when overstretched, and even tendon rupture can occur. How to effectively prevent muscle strain? Pay attention to strengthen the strength and flexibility exercises of the muscles in injury-prone areas, and at the same time, should be fully prepared for the activities, reasonable arrangements for the amount of exercise, in order to achieve the purpose of prevention. Muscle strain prevention, mainly for the cause of occurrence. Such as good preparation activities before strenuous exercise, especially the preparation activities of the strain-prone parts; weaker, training level is not high, exercise should be measured, to prevent excessive fatigue and load too heavy, to improve the coordination of sports techniques and movements, do not force too hard, improve the training conditions, pay attention to the temperature of sports venues. Pay attention to warmth in the winter when exercising in the field, do not wear too thin, pay attention to the observation of muscle response, such as muscle hardness, toughness, elasticity, fatigue degree. When rejoining training after a muscle strain, it is important to proceed gradually, do not be too hasty, and to strengthen local protection to prevent re-strain. Muscle strains sometimes occur in physical education classes, but the best way to deal with them is not always clear. The following is a brief description of the difference between chronic tendonitis and bursitis (two painful conditions affecting muscles) and tips for dealing with them. Chronic tendonitis and bursitis are two common conditions that occur between the muscles and bones. Chronic tendonitis is an inflammation of the tendon, which is located at the end of the muscle and is attached to the bone. If the tendon becomes inflamed, it is accompanied by acute or chronic pain with the movement of the muscle or joint. Bursitis is an inflammation of the mucous bursa, which is filled with fluid that surrounds the joint or tendon and guides and lubricates the muscles and joints. Inflammation of the bursa is characterized by severe pain, which is more prominent with movement, and limited joint movement If chronic tendonitis or bursitis is not severe, there are no sequelae after healing. Depending on the severity of the injury, the healing time is 2 to 6 weeks. Rest or proper joint exercises, restorative stretching and joint rehabilitation exercises, and physical therapy are all very effective. These treatments can reduce pain, avoid tissue scarring, and restore as much of the original function of the injured area as possible.