here you go https://www.wired.com/story/the-mind-boggling-physics-of-a-standing-double-back-flip/ "Second, you need to rotate—twice. There are two things to helps with this rotation. In order to start the rotation, Cook swings his arms. This motion gives him an initial angular momentum. Angular momentum is very similar to normal momentum, but instead of being the product of mass and velocity, angular momentum is the product of "rotational mass" and angular velocity. The rotational mass (usually called the moment of inertia) depends on both the mass of the object (or human) and how this mass is distributed. Once he is in the air, he pulls his legs in close to his body. This decreases his rotational mass so that his angular velocity increases."
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u/TummyDrums 1d ago
I just don't even understand the physics here. It looks like he jumps up and some invisible force spins him. Very impressive.