The 4 way grinder is survival of the fittest! It’s like a 4 Way Tug-O-War, but BIGGER!
The 4 way grinder uses 2″ heavy duty webbing. It forms a square in the centre. Each player is in an uninflated inner tube in each corner. They are pulling against each other to try to reach their ball and bring it back to the centre cone first.

It will grind you up.