Limiting the body, limiting the brain.
To feel the real isolation of the battle unit called “team” vs. the rest of the world, the runners in each team will be tied to each other with a rope through the weist.
You may want to go away from your partner, you may want to hide behind a tree, if you need a toilet… or you will just want not to be tied to someone else for so many hours! But whatever you do, do not untie or cut the rope, because this will immediately disqualify your participation, regardless your progress so far!