I signed up for a yoga class because I wanted to learn the lotus position. The instructor asked me how flexible I was. I told her I can't make it on Tuesdays.
A guy from Nepal I once knew actually warned me not to follow the meditation stuff too deeply or it would lead to some very dark (occult) places.
LOL! Yoga is only religious in the US if you go to some flake “spiritual yoga” place. If you just want to get more flexible, it’s a great technique and is particularly good for people who don’t have a lot of strength or agility (to start with...yoga is harder than it looks, and you develop it).
I don’t do yoga because I prefer strength training but my sister does do yoga, and it has helped her flexibility - and her joints - enormously.