Female athletes are especially vulnerable to ligament injuries. They can learn to protect themselves—by behaving more like boys.

"I just went up to kick the ball, kind of off balance and when I jumped my knee collapsed," the 17-year-old said. "I mean I've done that movement hundreds of times before and my knee just went, I ...

Ashley Nicole, CPT, is a trainer with rheumatoid arthritis and knows knee pain during lunges. Here’s how she helps clients lunge with proper form and pain-free.