What's up with muscular guys smiling at me at the gym?

Hi, guys
I don't know why, but big men smile at me at the gym.
And I'm a guy myself, and no, I am not a muscular guy like them, but these men, the ones that are serious, tend to send out a good vibe at me.
All the other people simply look tired and ill.

Hmmm...

What's up with that?
 
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