I had a friend in 2nd or 3rd grade who would stand on the swing seat to use his legs to assist with gaining height and then eventually do a backflip with the chains near parallel.

Of course we always begged him to show off this trick every recess. Looking back now I have no idea where he got the idea or how he practiced his way into it, but he was always a playground daredevil who routinely made teachers come sprinting over the tarmac.

I will say you knew you jumped far when that playground mulch embedded itself in your hands and knees.