I’ve really no qualms about working on myself, wherever. I will sit in the back of an event where I can squeeze and rub my hands and arms, even my knees and legs, so I don't have to worry about distracting others, but really, anywhere I'm waiting or sitting for more than a few minutes, I'm probably working on my muscles because I'm actually pretty impatient by nature, so waiting can make me tense. Next time you're standing in line somewhere, instead of scrolling, try this little hand massage while you look around. Or see if it revives you in a boring meeting or class. Also nice to do at bedtime or wake time.