Some injuries are caused by specific traumatic incidents. More often, though, they come on gradually over time, in the form of ‘overuse’ injuries, such as knee pain whilst running. 'Overuse' is a bit of a misleading name, suggesting that the best way to treat such injuries is to rest them until the pain has subsided, before returning to previous practice without changing anything. In fact, these injuries are caused by misuse, not overuse, and the only way to get rid of the pain in the long term is to change the movement pattern. For example, knee pain could be caused by the glutes not firing properly, tight hamstrings, or pelvic dysfunction – but you won’t know until the whole problem has been investigated.