UNCONTROLLABLE Twitching and jerking!!! :(

Hi
one thing is annoying me verry much when i attempt to AP, about halfway through my limbs usually legs suddenly feel like they are filling with energy and they try and twitch and jerk and its soo annoying, they arent tired at all and it always breaks my concentration and semi paralysis and they kick hard sometimes to, this also happens to my fingers!
so what do u think the issue is?
could it be that i didnt run around enough during the day, is there some malfunction in my nerve system or is my legs like sucking in energy because THIS ONLY HAPPENS DURING attempted APing?? thanks