The Olympics are a time when people all around the world gather in front of their TVs and say, “Oh yeah, that’s a sport.”

While many sports have made bizarre, unexpected entries into the Games (looking at you, breakdancing), others haven’t yet reached Olympic recognition. One of those sports is jump roping, where people aggressively jump rope until they just can’t do it anymore.

As with any competition, things can get pretty fierce. Still, I think you’d be surprised at just how intense it can get, as these videos show.