"I started ballet in my early 20s. I studied for about ten years. Ballet is probably the one of the hardest things I've done, almost like MMA. People don't give it a lot of credit and think it's easy, but it's very difficult. For an athlete, you use muscles you really don't use, and ballet is something I really respect."
January 1, 1970
https://en.wikiquote.org/wiki/Ballet