I have names for everyone at the gym. I go there at 5:30am and instead of being social (who is at 5:30am?), I just create fake names for everyone. "Grunt guy", "Cologne Guy" and "Dresses like she's from the 80s girl" are just a few.
Check out this video! I've actually seen stranger things at the gym than this, but this is pretty funny. Especially the end!