Good exercises while resting a foot?

So I hurt my foot (an area at the top of my right foot hurts) a few days ago and I'm hoping it's something pretty minor (I have a doctors appt. Tuesday). I run track (sprints & hurdles) and our first varsity meet is in two weeks. I was wondering if anyone had good ideas for things I can do to build/keep muscle while not using or putting pressure on my foot? I'm in really good shape right now but I was thinking of mostly upper body/core stuff. In case my foot takes two weeks to heal I want to be able to run at the meet.
Good exercises while resting a foot?
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