I forgot to say, N95 masks are somewhat reusable. The instructions on mine did say that you should flatten, then reshape the metal nose bar every time you put it back on. I can get at least 3 days of use out of each mask, unless I get it sweaty by wearing it to the gym. So I usually keep a gym mask set aside for workouts and wear a clean one for the rest of the day.
Also, as a rule N95 masks don’t work when you get them very wet.
There are easier yoga classes! Definitely.