Most religions have an aspect of movement in them... christian people stand and kneel during church... followers of Islam have special movements that go with daily prayers... Hindus and Buddhist dedicate large portions of the day to body movement (yoga)... they even wrote a book called "Kama Sutra"...
as the differnt people who practiced yoga spread out into the land north of India they spread into different areas and each area adopted its own separate practice. some focused on meditating through movement. others focused on how they can affect the world through these movements. each province in china had their own practice and each practice is a separate religion that all stem from the same tree ...
we know these practices collectively as martial arts...