I’m an American, and I had to ask my wife what that was the first time I saw it. And then I needed an explanation on why that was a problem, because I had thought the point of text messages was that you could read it and get back at your convenience, as opposed to a phone call you have to respond to in the moment.
Apparently I’m old.
Mirror selfies seem like a very reasonable thing to do at a gym, particularly if you are looking for progress pics, taking the same picture in the same location while it’s still in your mind.