Replying to Foot Cramps

This is really pissing me off and it needs to stop. I was hoping somebody here had the problem and could help. Anyways, whenever I try to tail press, or lean real far back to tail butter or whatever, I get a horrible cramp in my foot right away. It hurts like hell and really stops my whole skiing right there for like a minute. It just sucks not being able to lean real far back and manual on trails and shit. So I was hoping somebody could give me a remedy or something.