The 20-pound ponytail lift.

I'm not even certain what CrossFit is exactly, but from what I can tell from the video, it's a lot like regular weight training, only with way more shouting and someone spotting you with a video camera for when you inevitably drop an 80-pound barbell on your throat. Because it seems the most important aspect of CrossFit is letting other people know you're into CrossFit.

Sources: Uproxx