My body starts moving when i meditate

[Guttersnipe]

It's your mind.

It abhors a vacuum and needs energy and activity. So you're telling it to slow down until you enter that other consciousness. And it's trying to sabotage it's self. Just acknowledge what you're doing and steady yourself then continue meditating. Like any other skill, it takes time to develop but persistence and practice get you there. Keep at it and good luck!