Found your comment riv heh. He's Swedish apparently, interesting.
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I'm not a fan of sports so didn't notice this at all my self but apparently AoA are doing Exos thing of mixing sports up. Kpop really does love to have lots of MVs/Songs follow some concept all at the same time, so maybe the current concept is mixing sports up xD
From reddit:
"Why were the male cheerleaders all wearing NBA jerseys at a Lacrosse game?"