I'm OK with being greeted when I get to the gym. "Thanks, Janae." "Have a good workout." Or even, "Hello." These are all fine.
But when I'm on my way out of the gym, I don't like to be acknowledged. I don't want anyone telling me, "Goodbye," or "See ya," or, "Have a good night."
Thanks, but I felt special on my way in. I don't want to be seen on my way out.