Do anyone has a source for chair exercises or things that can be done while sitting?

My surgeon doesn't want me working out for 3 more weeks. I would love to find some exercises that I can do sitting down especially at work since I am often alone in the office. I saw someone who mentioned "chair dancing" once in their profile. What is that? I have 230 more lbs to lose and want to help build muscle now before I can get into a water aerobics class in a couple of weeks.

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