LSD

Definition

"Long Slow Distance"—extended runs at conversational pace to build aerobic base. Despite the acronym, the only trip involved is the mental journey of running for 2+ hours.

Example Usage

Sunday's LSD run is 18 miles at zone 2 pace—bring podcasts and patience.

Origin

Coined by running coach Joe Henderson in his 1969 book 'Long Slow Distance: The Humane Way to Train'

Fun Fact

The term became popular during the jogging boom of the 1970s, when the acronym had extra cultural relevance.

Source: Distance running training methodology

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