Overuse Injuries
Exercise puts repetitive stress on many parts of the body such as muscles, tendons, bursae, cartilage, bones, and nerves. Repetitive stress from such activities can lead to minor orthopedic injuries that will heal with rest. If your body never has a chance to rest, though, those traumas can build up overtime, leaving you prone to overuse injuries.
Common overuse injuries include damage to elbow cartilage in athletes who throw, heel bursitis and stress fractures in runners, nerve entrapment in rowers, and kneecap tendinitis in volleyball players - Safe Exercise.