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His left thigh, his jumping take-off leg, which was always an inch and half thicker than the right, is now two and a half inches thinner. BNCB
Jumpers will sometimes say that their take-off leg feels like it collapses when they plant and try to jump. Google
On the third stride before take-off, the jumper lowers the center of graivity by flexing the take-off leg and extending the arms downward. Google
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