Do squat, mild back pain is a normal phenomenon, but if the persistent back pain and the symptoms are heavy, it is not normal, the details are as follows: 1, mild soreness: if the patient in the squatting action, the lumbar has a mild soreness, is a normal phenomenon, belongs to the lumbar muscle injury. After resting, the symptoms will disappear soon, and will not affect the training in the future.2, persistent soreness: if you do squatting, there will be persistent soreness in the waist, affecting the normal lumbar spine activities, and is not a normal phenomenon. Generally indicates that the lumbar muscles have been damaged, also suggests that the load is too heavy, should choose the right weight for squatting. At the same time should pay attention to bed rest, the use of lumbar protective gear short-term protection of the lumbar muscles, can make the clinical symptoms improve. Therefore, when doing squats, attention should be paid to protecting the lumbar spine and lumbar muscles.