By loosening muscles and connective tissue, it gives you a greater range of motion.
Athletes can especially benefit from proper stretching, both before and after exercise.
Begin by stretching three to seven days a week. Work gradually, increasing the stretch as your body starts to adapt. The muscle should feel somewhat tight, but never painful. If it hurts, you're stretching too far. After exercise, stretching can also be helpful in reducing soreness, and regaining flexibility.