So Mark Singleton wrote a book called Yoga body which supposedly claims that many of the asanas or poses came from European primitive gymnastics and not from India
They were later given hindu names
There is nothing necessarily involving polytheistic worship to do a exercise from Europe that was renamed after a hindu god by a hindu
That being said some of the practices involving chanting the name of hindu gods would seem like polytheistic worship to me
You have to be careful and really decide how different exercises in yoga would effect your mind before deciding if you should do them
Some exercises maybe bad for the minds of some people
I think some of the Asana poses and some Pranayama breathing exercise practices are fine for most people
But there are a bunch of other practices in some schools of yoga which maybe bad for the mind or body
@sardonicsmile
I am not counting the sealing exercise where people cut their tongue in order to stick it up their nasal cavity from inside their throat as a breathing exercise
I would suggest that doing amateur surgery is unsafe and that people should not do that if they are not medically qualified or maybe not at all