Exercises you can do with Crutches.

I recently had a Plantar Fasciotomy/Release and I have been non-weight bearing for 3 weeks. I was going crazy, so I had to start doing some kind of exercise. I did a video of some of the stuff I have been doing. What kind of creative exercises would you do? Check out the video and suggest what else you would do to get the heart rate up without using my other leg? Here is the Video: http://www.youtube.com/watch?v=FdH_giemmcg