Due to issues of my own, I have recently become a new member of the posture police. If you practice like I do, you spend many hours per day slumped over your instrument with your neck hyper extended looking downward. Remember I’ve suggested you practice while using a mirror (search the archives for that blog-- it’s a good one). Should you find yourself each day in the position described above, you are looking at a ruptured cervical disk-- painful beyond description and potential loss of all feeling in your left hand. Look UP!!!