Knee pain can be a daunting obstacle to success in fitness. When my clients complain of knee pain, I try to nip it in the bud right away so they can reach their fitness goals without aggravating this important joint. If an injury gets worse, it can cause setbacks or even force you to stop training. The good news is that knee pain is often just a warning that you might be overtraining or moving incorrectly. If we listen to this warning, we may be able to avoid a real injury and even the need for surgery.