Forcing The City Gates is a traditional Chinese game for boys - and one which requires a fair amount of energy and some outside space to play! This game can get rough.
You will need a group of at least 6 boys. Two captains are chosen, and each picks him team-mates. The two teams line up opposite each other, holding hands.
Now one boy from one team starts by hurling himself at the other side's line, trying to break through between two boys. If he breaks through, the boys on either side of him must go back with him and join his team. If he doesn't, he stays and becomes a member of that team.
Alternate between the teams until one team's wall is broken up.