- When you exercise, you're causing a bit of trauma to the body
- If you're not allowing the body to recover, you're causing yourself more harm than good
(CNN)We've all been there: Just when you're getting into the groove of your new workout obsession — wham! Suddenly your knee is killing you, or your quads are hurting in a way that just doesn't feel right. Yep, you've over-worked yourself into an injury — and are suddenly wondering why you didn't take a few more rest days along the way.