When I empty out intentions and relax in meditation, what is this force that moves my body in complex patterns?

When I empty out intentions and relax in meditation, what is this force that moves my body in complex patterns? For example, when I let go for a bit I start walking and making circles and doing movements with my hands (mudras), and even martial arts type of moves with intricacy and intelligence. There is a force making me doing it and I feel my body following energies like a magnet. So the questions are: 1) why does it happen? 2) what am I suppose to do with it? 3) is this like wu wei of taoism or Tibetan Buddhist Shamans channeling spirits?