The Bonk

Definition

Sudden fatigue and performance collapse during endurance exercise, typically from glycogen depletion or dehydration. It's less romantic than it sounds.

Example Usage

Around mile 15 of my run, I bonked hard and had to walk the last three miles.

Origin

Endurance sports slang; etymology unclear but in use since at least the 1970s.

Fun Fact

Cyclists call it 'hitting the wall'; the experience is similar across endurance sports.

Source: Endurance sports vernacular

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