Sit spin
[1] It was invented by American figure skater Jackson Haines.[1] According to figure skater John MIsha Petkevich, despite its difficulty to learn and the amount of energy it requires to execute it, "yields immense rewards"[1] for the skater.There is a wide variety of sitting positions skaters have invented, and also according to Petkevich, the choice of a sitting position are not determined by aesthetic design or technical objections, but is often determined by convenience.[3] It is difficult to learn and requires a great deal of energy, but it has variations that make it more creative and pleasurable to watch.[3] The best sit spin position minimizes the moment of inertia and keeps the heaviest parts of the body as close to the vertical center of gravity as possible.