
The Yoga Body: The Origins of Modern Posture Practice is a scholarly book by Mark Singleton that explores the historical development of modern yoga. It challenges the common belief that modern yoga postures are ancient, instead tracing their roots to Western gymnastics, bodybuilding, and early 20th-century Indian nationalism.
For example yoga there is a good book called the yoga body which will destroy a lot of people's yoga practice.
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"Ido Portal mentions this book specifically to illustrate how modern yoga has been influenced by Western systems like Swedish gymnastics and is far more linear than traditional, rounded natural movements."