This would make me livid. He wants to see you jumping around?! Tell him to go to youtube and watch Jillian Michaels vidoes if that's what he wants to see. If what you're doing isn't good enough for him, then he needs to put a sock in it.

Please tell us that he's not actually talking down to you or mocking you, because that would pretty much be abuse.

If it were me, I'd have ONE final conversation about it. Tell him what you said here: maybe even show him this thread. And the points I'd be making are: a) My body is my responsibility and no one else's, therefore it will be MY decision and my decision alone on how I'm going to eat and exercise, and b) if he can't be supportive, his unsolicited opinion is not welcome. End of story. And then hold him to it: "This isn't up for discussion" is a very useful phrase.

Best of luck.