Shoes are the most important piece of equipment.
If they do not fit properly, an athlete can develop severe blisters, shin splints, and very sore ankles and knees as a result of tendinitis and joint inflammation. Runners should only wear running shoes and not cross-trainers. Look for shoes that are stable, yet flexible. A shoe that is too stiff can lead to knee, hip, and IT band problems. When an athlete goes shopping, I suggest going to a sports specialty store.