This is true. But these concepts do not have anything to do with the evolution of the science Proper. Yoga is comprised of highly evolved and practical techniques which may be applied by persons of any race, nation, caste, creed, church or sect. As philosophical definitions were being formed and as religious concepts of the Hindus were being formulated, the science of Yoga was evolved. Certain metaphysical concepts are peculiarly Hindu and Eastern, but Yoga which is separable from its philosophical and metaphysical background, is a science of universal and practical value.
Yoga is essentially a spiritual matter concerning spiritual methods.
And it is the heritage of all humanity. On the top of a branch there was a very big honey-comb. But the ascent to the top of the tree was difficult. A slender creeper entwined that tree and reached up to a great part of the height. It appeared to be strong, though it perilously dangled in the air.