TIP
"Your left arm is straight, but you're not keeping your head down."
-Otter (Tim Matheson), Animal House

CUT!
In the words of John Belushi's Bluto: Burrrrrrp! "A straight left arm is fine, but don't become rigid or you lose feel," Grayson says. "And a too-still head means you can't rotate your body."

TAKE TWO...
"Keep your left arm tense, but don't lock your elbow. And let your head sway a couple inches back and through—like you're doing a modified Stevie Wonder impression."