We hate speaking in absolute terms, but we have never seen kids jump rope like this...ever. (If you have, please send us a video!)
The video shows the Japanese school children from the Fuji Jump Rope Association. We think they comprise of no less than 50 kids. We can't say for sure because not only were they fast, but they were moving so perfectly in unison that we had to rewind the video just to see how many rounds they did.
About four to five kids, arms linked, formed one row for a total of 10. One row after another jumped through the rope, which we could barely see at this point, to do a total of four rounds, non-stop. If one child missed the jump, his row and those that followed would have toppled down easily. We could only imagine the hours of practice it took to do this synchronized jumping routine.
After the last round, the kids practically let out one big whoop, cheering and hugging each other for a job done perfectly. We're cheering loudly here, too, guys! You're all awesome!