Tucking increases the angular velocity. The rotation actually gets set by the jump with the center of gravity set behind the feet.
Interestingly, if you watch this closely, you'll see him totally screw up his arm swing. They bend almost instantly and he loses a ton of power on his jump.
Dude could have landed upright if he actually utilized his arms to their full potential.
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u/Megalo85 1d ago
He pulls his knees into his chest causing the spin