Ultimate: miniature tanks

Mini game played after an ultimate game, from the upa coaching corps email list.

All players stand in a big circle with equal spacing in-between people.
You pretend that your left forearm and left shin are "one tread" and
connected so they move together, same for the right side. Everyone gets down
on their forearms and shins much like you are crawling. Together in cadence
you move one tread when you say "Miniature" then you move the other tread
when you say "tanks". Alternate each tread moving forward with the cadence.
People are not allowed to turn, or stop till someone has passed through the
center to the opposite side of the circle. When you run into someone else
you can go over them, under them, or just butt into them. If you get knocked
over you keep moving your treads in cadence but will not end up going
anywhere because you are on your side.