I've tight clothes too, I agree, it's far more comfortable... I guess his pants were of bad quality and too small, you could literally see everything. There are most guys in this class, and most of them have normal pants.
I guess I was a bit too taken aback when I saw this, so I didn't do that. It's not what you would call proper sauna behaviour
I personally don't care about people's appearance in a gym, I'm glad to see people actually do something for their health. And even I'm a bit prudish, this guy was extreme. I'm normally relaxed when it comes to nudity, being a Scandinavian, but this was a bit too much, to see a guy's private parts in weird angles and things dangling both here and there.