Fitness
Long Slow Distance
Long slow distance is extended easy aerobic training that builds endurance base—most effort stays conversational, not race pace.
Long slow distance (LSD) is extended aerobic work at easy conversational pace—building mitochondrial density, tendon resilience, and mental durability for endurance events. Duration matters more than pace ego; most minutes should stay in zone 2.
Fuel and hydrate on runs over ninety minutes.
Common questions
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How slow should LSD runs be?
Conversation pace—often zone 2 heart rate. If you cannot speak in sentences, you are probably too fast for a true base long run.
Related terms
Put Long Slow Distance into practice
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