Fun activities for getting in shape?

Boxing! I've been doing a boxing cl at my gym for the last three months and I love it!! It's boxing with gloves and pads, so it's not actually boxing against other people in a ring or anything. It's excellent exercise, both strength training and cardio (our instructor incorporates a lot of sprints, lunges, etc into the cles to make it interesting). Boxing is the one exercise I actually look forward to doing! I highly recommend it :-P