I'm with you; I'm pretty bad about fiddling with my hands when I pray. A method that works for me is to fold my hands when I'm feeling figity while praying. For the leg shaking, maybe (whenever possible) pray while kneeling.
Normally I think body position is not very important for prayer, but for people like us sometimes certain positions make it easier to focus on God.
Sometimes, but not always, it could be all in your head, your brain subconsciously got used to doing that. So you can try to force yourself not to do so and you will see that after sometime you will stop doing it. It could also be from satan to distract you from praying and focus on something else.
Comments
Normally I think body position is not very important for prayer, but for people like us sometimes certain positions make it easier to focus on God.
George