When you're finished, if someone's standing there waiting, you're supposed to get up and let them in. If you're the one doing the waiting, a good way to clue them in is ask, 'Would you mind if I work with you?

That's the No. 1 complaint we get.

You'd think people would have enough courtesy to dry off the equipment without being asked, especially since we hand out towels at the front door. But you'd be surprised.

Putting on headphones indicates you want to move fast. They say: We'll chat later.