The Greatest Women's 4x100m | Jamaica DESTROYS USA with a World Record

The Greatest Women's 4x100m | Jamaica DESTROYS USA with a World Record Jamaica's women's 4x100m relay squad ran 43.28 — a world under-20 record that senior squads would medal with at the World Championships. This breakdown explains how four athletes under 20 built that time through exchange mechanics, curve biomechanics, and velocity compounding. Blind exchanges, damp track adaptation, stride frequency data, and the 0.47-second gap over the US national record squad — all in the splits. The real story isn't the winning time. It's the three exchange zones where Jamaica banked 4 to 6 meters of positional advantage before the anchor even accelerated. This video breaks down every leg: Serena Cole's drive phase geometry, Tina Clayton's back-straight velocity, Tia Clayton's curve cadence, and Kima Nelson's anchor split. We also explain why the US ran a national record and still lost by nearly five meters, and what Colombia's bronze reveals about the growing depth of international relay sprinting. The technical model Jamaica used here is replicable — but only by programs that treat relay mechanics as a standalone discipline.