but-

One explanation says that for the mantra, “One has to chant a word or a phrase until he or she transcends mind and emotions and in the process the superconscious is discovered and achieved.”
Note the use of “word” in that mantra-like way in order to move into the superconsciousness.
In other words, yoga exercises are a spillover from that kind of verbal repetition and philosophy of how one moves physically and emotionally and intellectually to this superconsciousness.
So yoga focuses on harmony between mind and body.
Yoga derives its philosophy from an Indian metaphysical belief.
And the word yoga comes from the Sanskrit language and means “merger” or “union.”
And the ultimate aim of that philosophy then is to strike a balance between mind and body and attain a kind of self-enlightenment through the use of mantra and through the use of certain kinds of physical exercises or meditative stances.
To achieve this state, yoga uses breath, posture, relaxation, and meditation in order to bring about a healthy, lively balanced approach to life.
Christians have a radically different worldview than either of these or the view shaped by yoga, the view shaped by tai chi.
Our approach towards history and towards God and towards well-being is radically different.
In Christianity progress toward wholeness moves from a God who communicates intelligibly-
– through language to be understood,
– through a person, Jesus Christ, who becomes fully human and speaks to be understood by the mind, not the  cancelling of the mind— through his death and resurrection objectively overcoming a real Satan and real  guilt before God through a real gospel message for us, once for all in history with historical events  behind it,
– through an understanding of that message in our minds consciously,
– through faith in Christ, through the indwelling of the Holy Spirit,
– through the promises understood and believed,
– through joyful meditation on those objective promises,
– through the transformation of the Holy Spirit, through objective word understood as we meditate in  progressive likeness to Christ as we see his glory in the Word and in the gospel,
– through practical deeds that lead to help other people,
– and through a life of transformed godliness into eternal life where God is our joy forever.
That is Christianity.
And it is totally different than the kind of worldview that lies behind the meditative, physical and emotional and intellectual practices that flow out of yoga and tai chi.
So, consider Christian wholeness of the health and the body.
If you ask, “How does that relate to the body?
How does that relate to exercise and stuff you do with your body?”
I would say Christian wholeness of the health of the body is marked by these facts:
1. We are fallen and physically under a curse and emotionally and intellectually under a curse on the whole of creation. And, therefore, we will all die.
2. We will be raised from the dead if we have faith in Jesus, and this is the health we are ultimately aiming at mainly. We will be perfectly healthy — body, soul, and mind — in the new heavens and the new earth after resurrection, and that is our glory — that is our hope.
3. In the meantime, our outer nature is wasting away, bu our inner nature is being renewed day by day.2 Corinthians 4:16.
4. So bodily exercise is of a little value as Paul says in 1 Timothy 4:8. But spiritual exercise is of value in every way in the way I described it a minute ago.
5. We should not unnecessarily damage our bodies which are the temple of the Holy Spirit, and we should seek their maximal usefulness in the goals that God has given us. So physical health is wonderful, but it is not the goal. It is a means to much greater goals and a qualified means at that, because there are more important means than having a body that is super fit.
6. We may accomplish our greatest goals by dying, by risking our lives and getting Ebola or malaria or river blindness in some missionary activity. We don’t strive for maximal physical well-being. That is a subordinate useful goal as a means to something greater. And it may be compromised intentionally by risking our lives for
the sake of somebody else.
7. So any physical regimen that begins to take the place of the pursuit of holiness and sacrificial service by which we may lay down our lives is starting, probably, to become a religion for us. And it seems to me that yoga and tai chi have already declared themselves by their very names on that score. They have run up the flag of the eastern religions by the very name yoga and tai chi.
As I assess maximizing rather than minimizing my pursuit of God’s goals and the flourishing of my own soul

– I would go another way and find another kind of exercise.