When a weird sport is called "shin kicking" there's not a lot of nuance that needs to be explained. Two people stand in front of each other, grasp arms, and attempt to kick each other in the shins as hard as possible until one person is knocked down two out of three times or loses the ability to stand upright. Combatants stuff their pants with hay, which is apparently supposed to help making the kicks hurt less. We're guessing that since it's hay, it doesn't do much of anything. No word on what the winner actually wins.
Because walking is overrated.