Western yoga has been evolving over the last couple of centuries. An age-old proverb says - Truth is one, wise express it in many ways. Indian teachers came to the West and Westerners went to India to learn about Indian Philosophy - Yoga. Ideally speaking, Yoga is free for all. Some teachers started charging a fee for making a living, which may be fine. Slowly dilution of purpose occurred and some worst-case teachers turned to be opportunists. The result is most of the Western Yoga schools/studios focus on postures, yoga pants for flexibility a few raise to teaching breathing techniques for a calmer mind, and rarely few pickup the actual spirit of Yoga described in original texts Bhagavad Gita or Patanjali yoga sutras.

" The total structure of life requires of our total being to be united with it in a practical demonstration of thought, speech and action – this is yoga." [https://www.swami-krishnananda.org/patanjali/raja_01.html]

If you want to know what yoga is, a good starting point is Aurobindo's "The Synthesis of Yoga "[http://www.sriaurobindo.nl/docs/Sri%20Aurobindo/23-24TheSynt...]

Lastly, it is a happy coincidence people (including Indians) like yoga exercises. Most of us will be happy with the results of the exercises resulting in flexibility and transient calmness in mind. Real seekers go after Yoga for years and it is not available down the street or online. In reality, ultimate Yoga - a union of gross, subtle, and causal bodies - is very high-bar to reach.

Hopefully, it gives some people a glimpse of the original idea of Yoga. I'm sorry if this is too wordy and preachy.