Spirtuality begins in the loins,
Ascends up the back
And returns to the navel.
- Deng Ming-Dao
I have no doubt that Tai Chi and Chi Gong are an exercise and practice in connection to the the psycho-physcial energy of which her refers concering circulation. Since I am not a practitioner of either, I can say nothing in regard to how they influence spirituality. What I do know is that people can and do use these practices as a means to feed the ego. It brings to mind Josepsh Campbell's reference to religion being an obstacle to a religious experience. If one concentrates on the activity that is suppose to support spiritual attainment, then it is very possible that it could be the thing that also blocks them from that which they seek - kinda like not seeing the forest for the trees. I want to add that if there is a practice that is suppose to support your attainment of spirituality and that practice has been devised by humans, it will most likely be that which keeps you from that which you seek.