The main reasons for frequent muscle strains are the following three: 1, the muscle area itself has been damaged, not fully healed, the activity is too early, resulting in local not fully connected, the formation of scar tissue, resulting in a decline in elasticity and toughness, when the force is likely to exceed the local load, and there are often strains. 2, the muscle strength itself is low, this muscle to bear the load is often So athletes should be fully warmed up before the activity, so as to avoid muscle tissue damage.