1 definition by Denise Schmigelski

Top Definition
Long Slow Distance is just one of the runs needed in the training program for someone intending to run marathons; speed, strength and hills are also important. So if you hear a runner say they have to go to bed early because they are doing LSD in the morning do not call a rehab center.

L S Ds and Speed are for runners!
L S Ds are part of any serious runners training program; Thursdays are my LSD runs.
by Denise Schmigelski October 20, 2006
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