How do you judge someone at the gym?

I know we all do it. And I know that 99.99% of us aren't proud that we do it. But judging other people at the gym is part of the fun of going, isn't it?

What do you judge others for at the gym? For me it's:

- Anyone who's working out in sweats. I'm talking like, cotton sweatpants and sweatshirt. I'm just overheating looking at them

- Anyone running on a treadmill with their hair down. I'm just shocked that they made this choice and are sticking with it

- Anyone who's next in line for the showers and isn't paying attention to when it's their turn to go in. It's really not a big deal at all, but it bugs me to have to nudge someone and be like, "that one third on the left is free!"