[SketchySeaBeast]

Soccer is a totally different game than running - it's basically a game of "how to best apply extreme forces to your lower body in unstable positions". You're twisting and turning and applying force in ways the body wasn't meant to handle in any sort of repeated manner. I can definitely see how running would help - it'll help build up the muscles and surrounding tissue, but really, when it comes to longevity of the joints, soccer is just bad news.