Until 1968 every high jumper went over the bar face-down, using the straddle or scissor technique honed for sand and sawdust landing pits. When foam mats replaced the pits, the constraint that had shaped the technique — must land on your feet — silently dissolved. Fosbury alone took the implication seriously: he turned his back to the bar and went over headfirst, landing on his shoulders. He won gold in Mexico City. Within a decade every elite high jumper in the world used his technique.
The principle: Most techniques were shaped by a constraint that no longer applies. When the substrate changes, the right move usually changes — but rarely as fast as it should, because the technique feels like the sport.