I see now. At first I was guessing it was your two legs banging together, but that sounded a bit weird.
So I guess your calves, along with the rest of you, are quite sore when the ride is through...
Thanks for defining that term, I've never heard it before. I guess it's mainly known in behalf of Arrow 4th dimensions (I hope).
(Holy crap, this ride is freakin' me out! I've never really been 'hurt' on a coaster before)