I think everyone should take ballet classes. I know that not everyone wants to be a dancer, but if you are interested in staying in good shape, physically and mentally, for a long time, you should just take ballet class as often as you can. It's much better than jogging. When you're jogging, your mind is someone else, and you're not even relaxed mentally. When you run, you are just using energy and getting more and more tired. But with ballet, it doesn't matter if your execution is awful. The whole idea is that you are mentally in control. You say, 'All right, leg, developes, All right, now turn.' You are in total control and this is not true of most sports. It gives you a sense of power."
Suzanne Farrell, in The Dancers' Body Book