Leapfrog

Leapfrog is a children's game in which players vault over each other's stooped backs. The first child rests hands on knees and bends over, this is called giving a back.

The next child places hands on the first child's back and leaps over by straddling legs wide apart on each side. On landing this child stoops down and a third child leaps over the first and second, and the fourth over all three successively.

When all the children are stooping, the last in the line begins leaping over all the others in turn.