Yin suction in the hands like water

I noticed today while doing arm swings, that when the arms moved out and expanded away from my body there was a suction feeling, almost as if water were being sucked into the palm. It had a very liquid feeling to it. I could feel a sort of turbulence in the flow. Very strange. The feeling of suction is right but i don't know about the rest of it.. I can feel the Yang expansion on the Yang surfaces at the same time.