Basic Leapfrog
When you play leapfrog, you merely have players line up and have them all crouch down or bend over, approximately 4 feet apart. The last person in line then proceeds to hop over all the players until he or she reaches the front. Commonly, when playing with older kids or adults, you can have them just bend over and put their heads down, which will make it more challenging for all the leapers. Play for fun until everyone tires of the game.
Young Children
When you play leapfrog with young children, it will likely be quite hard for them to leap over another child who is simply bending over. When playing with young children, you can have them crouch low on the ground or even kneel on the ground. Also, with youngsters you should be clear about the rules and make sure they keep their heads down until the leaper has leaped over them completely, otherwise they could bang their head on the body of the leaper.
Leapfrog Race
To make leapfrog more interesting, make it a race between two teams of equal numbers. Have the two teams spread out with equal spacing between each player, perhaps four feet. Next, start by having the last person in each line begin to leap. The winner is the first team to have every player leap over every other member of the team in line, first. To make it more interesting, you could have multiple races between the same teams and see who wins more.
Small Back or High Back
When players who bend over for the leapfrog leaper, they can create an easier or harder obstacle depending on how they bend over. To create an easier hurdle, or a "small back," a player can bend over and put his elbows on his knees. Conversely, a player could make a "high back" by bending over with head forward and placing his hands on his knees, which would create a higher hurdle for the leaper.