Tai Chi

The exercise ladies on TV had me doing Tai Chi this morning. Apparently along with all the movements, you are also manipulating energy. As with most spiritual things, I can go through the motions, but I can't actually feel the energy. This makes me wonder if you can manipulate energy inadvertently by moving your body certain ways. Like if I flail my arms to avoid slipping and falling or to shoo away a fly, might I accidentally disturb my Chi or throw a load of negative energy at some innocent passer-by?