Have you seen the videos of people slack-lining tandem? It’s nuts. Either they have to be in a sort of lockstep that causes no wave action in the strap, or they bounce around like… well, like a cartoon.
Or like me when I was fifteen and broke my ankle while on a trampoline with a kid that outweighed me. That slingshot action is tough, man. Very tough.
By landing astraddle of that strap, that would be somewhat akin to the feeling of slipping and landing astraddle the crossbar on a bicycle.
Hmm. This looks less like kicking and/or boxing, and more like cats fighting. Amateurs. But, they seem to have youth going for them, strapping young lads, and all.
They could make a lot of money this way, if they’re strapped for cash…