Long ago I determined that maintaining good quality of life was, in part, determined by range of motion. At that time I began stretching everything that seemed tight and inflexible. I will never be 17 again but I move and bend in most ways I need to and in fact, I'm more flexible tham some men considerable younger. About 10 years ago I developed a very sore shoulder from tennis. This sore shoulder plagued me for about a year. A chiroprator gave me some exercises that cleared up the problem shoulder within a few days. From everything in my experience, stretching in good for you because it works. I have books on yoga showing stretches and have not taken a class but can see considerable value in doing so. There are various schools of yoga. Read up, get educated, sign up, go for it.