Guys...the context of the post is approaching women AT A CLASS. In this case, it's perfectly acceptable. I go to some classes fairly often and see the same group of regulars. There is plenty of socializing before and after class. I've approached women after class, "hey, I see you here quite a bit. My name is Trout". To the hot yoga girl, "Nice Bird of Paradise. Not a lot of us can do that one". Nothing creepy about that at all. Never had someone be totally put off. When i see them at the gym, outside of class we exchange greetings. I'm friends with a couple of them on social media.
I'm married, so my end game isn't to date or sleep with them. But if i were single, approaching women at a class would be golden.
That being said, do not approach women when they're on the gym floor with earbuds in. That's a huge signal that they don't want to be bothered. Easbuds=stop sign.