‘Yoga’ is derived from the Sanskrit word yujir, which means “to yoke, join, unite.”
By definition, Yoga is the physical, mental, and spiritual practice, for the union of Kundalini with Shiva.

The Kundalini serpent

Kundalini is described as an indwelling spirit or energy, lying “coiled” at the base of the spine, represented as either a goddess or sleeping serpent waiting to be awakened.
This is known as the “Kundalini Awakening”

Shiva (notice the serpent coiled around the neck)

Shiva, meaning “The Auspicious One” is a popular Hindu deity and considered as the Supreme god within Hinduism. Shiva is considered to be limitless, transcendent, unchanging and formless.

“Yoga postures are expressions or offerings of worship to the Hindu gods. If you do these postures and you do this breathing technique and this meditation, then you will be accepted by a god, little ‘g'”
-Laurette Willis, Personal trainer, Author, and former Yoga instructor for 22 years.

It is my conviction that a true follower of Christ, once made aware of the true underlying principles of Yoga, should have nothing to do with it.