Catholics: take heed! This article by Sue Brinkman on Johnetta Benkovic's Women of Grace® (of EWTN fame) blog explains why Tai Chi and Catholicism don't mix.
The belief that a life force energy pervades all of nature is known as pantheism and is not compatible with Christianity. The Pontifical Councils for Culture and Interreligious Dialogue called this impersonal energy force a “New Age god” in their document, Jesus Christ the Bearer of the Water of Life.Bottom line, if an individual Catholic decides that he or she can manage to do the exercises while steering clear of the philosophical and religious aspects of Tai Chi, it is his or her perogative. Nonetheless, such an activity should never be promoted on the Archdiocesan website or even permitted by the archbishop in a Catholic institution within his see, especially when it is known that the instructor is going to go beyond the exercises and promote use of (i.e., belief in) a pantheistic "life force energy".
“This is very different from the Christian understanding of God as the maker of heaven and earth and the source of all personal life,” they write. “God is in himself personal, the Father, Son and Holy Spirit, who created the universe in order to share the communion of His life with creaturely persons.”
[A]dditionally, many non-Christian beliefs are intrinsic to tai chi.
An article published by Catholics United for the Faith entitled “Hold Fast What is Good: On Borrowing Forms of Meditation from Eastern Religions “ points out that “even though Tai Chi is often used as a means of exercise and relaxation, as well as a martial art, it has its origins in the Chinese religion of Taoism.
“Although there is nothing objectively wrong with the physical movements of Tai Chi, there are many philosophical elements contrary to Christianity. The idea that the physical world comes from dualistic principles, which in turn come from an ultimate force, cannot be reconciled with the idea that the universe was created by an all-good, personal God. Furthermore, the attempt to channel and direct spiritual forces and the use of talismans violate the First Commandment (cf. Catechism, no. 2117).”