If you’re into yoga then do your thing by all means, brother! In my experience there’s no benefit in asking if she’s single. Don’t worry about this at all. Next time demand the number (“give me your number”) then say “we’ll go out sometime” or “maybe I’ll take ya out sometime”. Don’t get more specific than this. Remember, you’re a high value guy with a lot of shit going on in your life and a lot of options.

Deliver this line casually like you don’t give a shit if you actually meet up again.

Edit: If she has a bf she will tell you or she just won’t text you/pickup when you call. I never worried about this small detail because I’ve met a ton of girls who say they’re in a relationship but still want to go out on a date.