Running
Running in a way to reduce loading on legs. One method is to use a treadmill, the better is to run in minimal shoes. These allow the runner's feet to feel the ground and so not inadvertently overload the foot/ankle. Over-cushioned shoes prevent the foot from feeling what it is doing and can also damage ones shins and knees.  This topic has been very controversial.  There are countless coaches, runners, and scientists who argue that minimal shoes are a main culprit in injuries in runners.  They highly recommend shoes that offer stability and cushioning.  Many runners with injuries have found that switching to cushioned shoes has improved/cured them of their injuries.