Muscle strain
Damage caused by sharp contraction or excessive stretching of muscles during exercise. A muscle strain is an injury caused by a sharp contraction or excessive stretching of a muscle during exercise. This can easily happen with long chins, pull-ups, and sit-ups. After a muscle strain, the area of the strain is severely painful. You can feel the rope-shaped hard mass formed by the muscles with your hands. The pain is obvious, the local swelling or subcutaneous bleeding is obvious, and the activity is obviously restricted.
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