Since I see a lot of body-part threads in here, I think this goes too.

Anyways--I notice that a lot of cyclists have great calves! I have virtually no calves, and I'd like to develop them more (I'm trying to get rid of that piano leg thing, you know?). Are there any particular riding styles that hit that muscle especially? Like hills, big gears, etc?

I just started jumping rope, and that definitely creates a burn in the right place.