“Yoga” is a Sanskrit/Hindu word and means “yuj Atmana Brahaman ca” (“to yoke the individual Soul and the Soul Source”). This one Sanskrit/Hindu word accurately describes both the goal and the means to the goal. The various Hindu/Yogas are the religious teachings and practices by which Hindus acheive this goal of Spiritual-Realization.
The classic Hindu/Yogas are: Karma Yoga (Ethcis), Bhakti Yoga (Devotion), Raja Yoga (Meditation) and Jnana Yoga (Enlightenment). There several Yogas within these classic four Yogas, such as: Hatha Yoga (Devotional posture(s) to nature, the creatures and Hindu Deities and Sages) and Mantra Yoga (Sanskrit/Hindu chants).
True to any religion, respectively, the classic Hindu/Yogas are taught by qualified Hindus (to anyone who honestly wants to learn) and on a donation basis. Of course, anyone can formally become a Hindu after serious study and commitment.
So, what, then, is phony yoga? “Obviously” 99% of what is passed-off as “yoga” today. This phony yoga is completely contrary to Real Yoga/Hinduism. To get an idea of how totally silly is this “yoga,” imagine a non-Christain teaching classes (for a fee, of course) in Baptism meaning underwater therapy/exercise. It is a very sad fact, throughout history that many have simply decided (because “it feels good,” etc.) to steal and violate (often to the extreme) those of “other” religions.
It is pass time for this phony yoga movement to cease this crass violation of the established Hindu/Yoga religious tradition.