You get crazy in sync with one another, so much so that people think you have some sort of weird ESP connection.
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Image via HintTV.com
You don't feel well, you have a big deadline coming up, you're allergic to running, blah, blah, blah -- your feeble excuses may work with anyone else, but your fitness buddy has almost witchlike abilities to prevent you from quitting.
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Image via Giphy.com
Gone are the days of hitting up the gym in schleppy sweatpants. Not only has your buddy encouraged you to step up your workout gear, but you guys have been known to unwittingly show up in scarily coordinated outfits.
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Image via Pinterest.com
You show up to the gym having binged on junk food on a day that's not your cheat day, and you can barely look your workout partner in eye -- much less work out -- because you're that full of shame.
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Image via Giphy.com