Mike Boyle quoted a study recently that said, "60% of women that take up running will become injured."
Isn't that partly due to the angle women have from their hips to their knees that men don't? My doctor was explaining that to me and telling me about how there are particular exercises that can strengthen the leg to counteract that inherent weakness in the female structure, but most women don't know about this and therefore end up with a lot of knee injuries.