So, in other words, if a guru sees a Catholic priest in a Church praying, and the guru notes that the priest is in a yoga position, that priest is practicing spiritual yoga, because the guru is the authority. Correct?
As I stated earlier, and proponents as well as noted, that it boils down to “intent”. Are you intending to honor Hindu gods? If the answer is no, then it is not yoga. The word yoga means “to bind or yoke together”. However if a person says he is definitely practicing yoga…then who holds the authority of what yoga is and consists of?
If you are not intending to do the core of what yoga is: Then you are…stretching. Why is there such an aversion to that word?
Compare apples to apples, not to oranges. Is there an equivalent of Hindus practicing secular elements of Catholicism (as if such a thing exist). Your argument is comparing what many consider secular (western version of yoga exercises, breathing, etc.) to what everyone considers purely religious (Catholicism).
The thing is: Hindu’s intend yoga to be purely religious. It was created in order to “yoke and bind”. ( Hence the name yoga) Ok, so you aren’t intending to do that? Congrats, you are stretching.
You say: I’m doing yoga.
I say:
Webster’s Library Dictionary: Yoga

A system of Hindu philosophy, strict spiritual discipline practiced to gain control over the forces of one’s being to gain occult powers but chiefly to attain union with the Deity or Universal Spirit.
You say: Psssh, I’m not doing that.
I say: Oh, so you’re stretching?
You say: No, I’m doing yoga.
(Repeat)
As noted earlier, divorcing the spiritual aspect is the wrong way of looking at it. Body positioning, breathing, etc. are simply tools that some people use for religious practice. “Divorcing the spiritual aspect” actual means disassembling what someone else decided to assemble.
Hatha Yoga is the most common type of yoga in the U.S. According to the Shambhala Guide to Yoga by Georg Feuerstein, p. 26, “The heart of Hatha-Yoga is unquestionably breath control (pranayama), and a variety of techniques are given to manipulate the body’s energy (prana) via the breath.” (Prana is believed by the Hindus to be the universal life force, god-force or energy force).
Is that the part that you’re disassembling to reassemble into a form of Christian prayer?
As far as what is yoga, it is not me who decided that. It’s simply the manner that many in the western world use that term, and even the Catholic Church understands that. I would not be using “yoga” in the secular manner if it wasn’t used that way colliquially.
So you’re saying that you’re using the term because everyone else uses it.
Speaking of the Catholic Church:
Were you aware that The Vatican recently released a 62 page document called “ Jesus Christ, the Bearer of the Water of Life: A Christian Reflection on the New Age.” It lists yoga as one of the traditions that flows into the New Age. The document also states, “Yoga, Zen, TM and tantric exercises lead to an experience of self- fulfillment or enlightment” according to New Agers. It adds that they believe that “anything which can provoke an altered state of consciousness are believed to lead to unity and enlightment” The document goes on to say , “It is therefore necessary to accurately identify those elements which belong to the New Age Movement, and which cannot be accepted by those who are faithful to Christ and his Church.”
In addition, on November 16, 2003 Our Sunday Visitor published an article called “Is It Too Much of a Stretch?” by Marianna Bartholomew. Her article gave Vatican warnings about yoga and stated “The Church is calling Catholics to firm up their faith and consider whether New Age influences like those of yoga are subtly eroding their intimacy with God.” She quotes Pope John Paul II when he cautions “those Christians who enthusiastically welcome certain ideas originating in the religious traditions of the Far East” in his book, Crossing the Threshold of Hope.