Because in ancient time, there was a famous doctor "Hua Tuo "who investigated the animal movement and created a sequences of practices which help the patients to get recovery from muscle and skeleton injury. Plus it can also improve and stronger the healthy body.
This distinct discipline is 20-21st century if we use that name, but the understanding of the study of movement in life forms began centuries ago, at least in Aristotle's teachings. He studied the movements of animals. Borelli in the Renaissance studied the basis of muscular and skeletal functioning.
Later scientists in this field had to face the problem of multiple amputees thanks to WWI bombing, and again in WWII. The rise of sports disciplines brought the field of biomechanics into a thriving professional area that we now see in the 21st century.
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