The ladies, dressed in their athletic best, are competing in a mud run. It’s exactly what it sounds like — a racecourse packed with muddy hills, muddy pools, muddy tunnels.
At one point, the girls take on each other in a puddle. Things get silly. There’s a lot of giggling. Poor Kim’s braid even gets a little dip.
They also talk about dirty vaginas and butts. Because you know, that’s what sisters talk about when they’re on a mud-themed race.
Keeping Up With the Kardashians airs on Sunday at 9 p.m. on E! Watch the preview clip, above.