1 definition by Bombadier General

Top Definition
LSD
Stands for long slow distance. What runners do to build endurance or train for a long distance event, like a marathon.
Runner #1: Man, track season finally ended, and all my tough interval workouts are over.

Runner #2: So you're done with speed?

Runner #1: Yup. And I'm ready for LSD.
by Bombadier General June 09, 2008

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