When stretching you not only warm-up your muscles to action but it reduces the possibility that your muscles and joints will get rigid and you'll get a cramp.
Injured muscles may not be strong enough to support the joints, which can lead to joint injury. Regular stretching keeps muscles long, lean, and flexible, and this means that exertion "won't put too much force on the muscle itself," says Nolan. Healthy muscles also help a person with balance problems to avoid falls
