Izzy still is small and has a small mouth - but I found that soft toys with either long legs or bungy-type legs works best. I start by playing tug with her and then when she has a good gripe of one of the legs or ears of something - I start to slide her across our kitchen floor. Pretty good exercise there and then as others said I start tossing the toy or ball back and forth from one end of the room to the other. Have your BF sit opposite of you with enough space to do that. Or you can get a cat (ha...ha - we have 3) and Izzy chases the around like crazy from the day she came to us. This is Izzy chasing cats.......