I'm currently on crutches, and I'm also starting to sleep with an Everyman polyphasic sleep cycle.
While I'm adapting to this new sleep cycle I'll be tired, but will need to stay awake until my naps. To stay lively and awake I would normally go walking around the block, swimming, biking, etc. but since I'm on crutches I can't really do that.
What active things should I do to keep me wide awake when I get tired?