Before i buy the game, is there exercises you are forced to do or can you skip/change them? Because of a medical condition i can do most exercises except abs related fitness like Sit-Up.
So during battles you can choose what exercises to use from a list. There are arm, leg, ab and yoga exercises. After a few worlds in the game you're told that different exercises do more damage against differently colored enemies (red for arms, blue for legs, yellow for abs, green for yoga), so it recommends you use certain exercises at certain times. But you don't actually NEED to do what it says.
However, there are also obstacles in each level that do require you to do a certain exercise in order to pass, and those aren't optional.
But, there is an option in the game that lets you use a buttons to partially assist with exercises. I'm not entirely sure how it works because I haven't yet needed to use it, but I think it allows you to basically skip any exercise you physically cannot do.
I'd do more research on the partial button assist function though before buying.