the trend of Chelsea Boys at the gym wearing too-short t-shirts so you can see their pierced belly buttons is a bad thing. When hairy guys without piercings do it, it just makes them look like rednecks. As is wearing A&F shorts with Abercrombie across the ass. As are boys who go for that 70s look - feathered hair and all, parted in the middle -- paired with a vacuous stare. Unlike this it doesn't appear to be ironic.

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Update: I forgot to mention all of the guys wearing ski caps while working out.