HAHA Your name's NOS lol lovin it. And Yeah they are called heads springs, Banned gymnastics skill. Alot of moves that we do now days in PK/FR have already been invented but banned from gymnastics do to their difficulty level/danger level (alot o people getting hurt)and counter progression. Some skills will mess up other and work against another techniques. EX:( Kong gainer gymnastics term Hecked back Tuck, the kong works on driving your feet down while round offs and handsprings drive your feet up. on vault messing up a little means injuring a lot.