Swami Vivekananda’s Raja Yoga, published in 1896, became a best-seller and had a lasting impact on American culture […] Vivekananda’s yoga didn’t involve the asanas, or poses, that we know as yoga today, because asana-based yoga is a modern phenomenon—one that emerged from the Indian nationalist movement’s attempt to develop a distinctly Indian version of what was then called physical culture (essentially, physical fitness). The short version of this story, which scholars like Mark Singleton and Joseph Alter have described, is that Indian innovators combined facets of medieval tantric practices with elements from Indian wrestling exercises, British army calisthenics, and Scandinavian gymnastics. They called their system “yoga,” a word that previously had had very different connotations.
http://www.slate.com/articles/double_x/doublex/2015/11/university_canceled_yoga_class_no_it_s_not_cultural_appropriation_to_practice.html?wpsrc=sh_all_dt_tw_top