Where can I take dance, yoga or fitness classes in Gloucester or north shore MA?

I am a 22 year old female who wants to get in shape and have fun. I am looking for a community center or fitness center with fun and challenging classes somewhere on the North Shore of Massachusetts. Please let me know if there are any great gyms or centers where I can do any of these things. Thanks!Where can I take dance, yoga or fitness classes in Gloucester or north shore MA?Curves