Our son was involved with yoga, and we asked my brother-in-law’s spiritual advisor (very orthodox priest!) about it and he said the exercises themselves are fine, but to not follow the religion behind them ...
Exactly.
Yes, and I suspect that this is where most of the concern lies. If good young christian boys and girls go and start taking “spiritual” exercise classes from a bunch of hindus and buddhists who call themselves guru, soon they’ll be dressed in saffron robes chanting hare krishna in front of the airport. Probably a valid concern. I’m not going to stop.