Puberty: Curves

Curves or a Gym?

I'm looking to start exersizing on a daily basis. I'm not a fan of walking a treadmill and I do have some knee issues and an abdominal hernia. My doctors says I need to do "something" but they don't really tell you what. Should I join a gym or Curves? or start at home? any ideas for simple exersizes I can do myself would be helpful. PS my daughter will be joining/starting too.