Do people do yoga for exercise or as a hobby more?

It seems like it's an exercise to work on flexibility or something although I heard things like planks would have many benefits but some people supposedly do it as a hobby, I heard others do some weird juju with it and get into weird stuff like Astro projection and stuff, yoga has always been something I never understood, to me it all just seemed like very flexible people bending in strange ways to calm down or whatnot.
Do people do yoga for exercise or as a hobby more?
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