u should practice mills so u get the whipping concept...
anyways, if ur lazy and don't wanna get mills before headspins, ur hips should always be rotating.. if u can't whip as hard as u can w/o breaking ur neck, then ur neck is not strong enough
happy bboying pooopie
(lol don't worry u won't break ur neck but you'll get WAY better results if ur neck is strong and ur legs are locked)