Being mindful of "the hand"

During my mindfulness meditation today, I kept going back to the imagery... the hand reaching across the chest. It kept me a bit jumpy. I kept coming back to the breath. But this was interesting because I do not remember having any trigger, none at all. I suppose I know where I'm stuck right now. It was so hard not to move. I literally had to twitch, however hard I tried to simply be mindful of it. At least it came from the fact that I noticed it and "allowed" it to happen, rather than simply react to the feeling without even me noticing it. Feels good to notice the improvement.