Jump-Roping.
Do they still do it at elementary schools? Not the singular kind, but the group kind...two twirlers and a line of (usually) girls ready to jump in to hop to a jingle. That adrenaline rush as it became your turn, as you picked up the cadence of the rope to make your entry. I couldn't remember any of the jingles (mind going a little fast lately) but as usual, google helps out.

Down in the valley:

Down in the valley where the green grass grows
There sat my grandmother sweet as a rose
She sang, she sang, she sang so sweet
Along came my grandfather and kissed her on the cheek
How many kisses did she get that week
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and so on until that person messes up jumping.

Thanks to Traditions and Treasures for the memory tweak. There were several variations that could be run on that rhyme. More jingles here.