Fosbury flopped over the bar backward to win Olympic gold

As an Oregon teenager, Dick Fosbury could not clear competitive heights with the straddle technique every coach taught. From 1963 he began bending his scissors jump backward, arching over the bar spine-first — a form coaches ridiculed and one newspaper called an airborne seizure. Crucially, foam landing pits had only just replaced sawdust: the technique's precondition had existed for barely a few years.

The rules of the high jump had never specified which way a jumper should face. Nobody had looked at that door, because landing on your neck in sawdust was its own rule.

He reinvented the jump itself: curved run-up, back to the bar, landing on foam that had only just been invented. Legal all along; unthinkable until seen.

He jumped backward, arching over the bar, because foam pits had just replaced sawdust—making back landings safe and letting his center of mass pass under the bar.

Foam pits replaced sawdust, making backward landing safe for the first time.

Arching the back lets the center of mass pass under the bar, a mechanical edge.

The rules never specified facing the bar, so the move was legal all along.

Coaches ridiculed it, but Fosbury's competition success proved its validity.

When a standard method plateaus, check if the rules actually forbid the alternative or if it's just unexamined convention.

Olympic gold in Mexico City 1968; within a decade virtually every elite jumper flopped. The canonical proof that the door was always open. Fosbury took gold in Mexico City 1968 at 2.24m, and within a decade virtually every elite jumper in the world had switched. The Flop is the cleanest recorded case of a legal move nobody had thought to try — the door was open the whole time.