When rockin' out on a freewheel (works with the fix too), I like to use my calves to sorta bounce up and down just a little bit. Kinda like a trials rider does before doin' a huge bunny hop or something. Keeps your legs ready to do whatever at a drop of a hat. Also very nice for activley counteracting coffe jitters or post sprint jitters. Call it track-tweaking.

Like in tennis when someone is at the apex of a serve, you do a little hop and when you come down you can transfer that energy into the direction you need to go to get to the ball. NOW GET OUT THERE AND SHOW SOME HUSTLE!!