And then they all went outside for a game of Bo-Taoshi.

...to post this:

It's the Kings Firecrackers Jump Rope Team.

well-and-truly smacked!

… North Korea? No can't be, the crowd have a discernible sense of humour. All very camp though.

and you're on gruel and potato water for a week

As Wayfarer mentions, these seem to be sport science students. I think the video comes from a competition in Japan where the aim is to show how groups work together.