Hi Sandra. Medicare coverage issues are continually evolving and things that weren’t covered in the past may be covered in the future or present. There is definitely a movement among health insurers to cover or provide some sort of benefit for preventive care nowadays – fitness included.
So, I say check directly with Medicare. Your local office is (should be) listed. Give them a call, tell them that you have a “coverage question” and ask the program person this direct question. I think that the passage cited by Karin above is a good start, but I would also advise that you get your answer “straight from the horse’s mouth.”
I hope that this helps.