This long argued debate is nothing more than pure myth probably put forth by those too lazy to do this grueling, but very productive exercise. In fact, not only are squats not bad for the knees, but dozens of studies have proven that squats IMPROVE knee function and stability, therefore REDUCING the risk of injury! The key when squatting is to always use proper form and technique, and to never bounce or relax when in the bottom position. When you relax, by not keeping the muscles of the upper thighs tense, the knee joint will open and be subjected to very high stress. Over time this can cause damage and injury. So, keep your thighs contracted in the bottom position, especially if you pause, and your knees will not only remain safe, but they will get stronger!