plyos are the best. i got on a program after knee surgery and man did that work. you can do a general search for exercise ideas, there are a ton and don't require the purchase of special equipment. can make most of it on your on at home. one that is really good is taping on the floor a square box with four squares inside it. with feet together, jump back and forth between the inner boxes. you can change up the patterns you are jumping and the time you do it for.