To be honest, this thing is powered by a pull on a rope, so it doesn't really matter whether it's pulled by cows or by a rugby team. Doesn't it look fun? You have to wonder what happens when one person can't hold on any longer. A machine translation from the French YouTube description explains.
The craziest project of the summer! The first turnstile towed by oxen in the middle of a lake. The rules of the game are simple on this funny ride: who will hold the longest! Thanks to a trigger system made with 2 release carabiners, as soon as a person loose, the rope slips and the other is automatically dropped. In the end, the centrifugal force was such that nobody managed to hold beyond 30/35 km / h!(via Metafilter)