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Exertion The effort needed to sustain your pace from moment to moment during the workout.
Mild:Very slow, normal breathing, gentle push.
Light: Slow, conversational breathing, holding yourself back.
Steady State:Quick, relaxed tempo, huffing between phrases.
Threshold: Rapid, pressing tempo; audible breathing.
Ragged Edge: Forced pace; heavy breathing; unsustainable.
Maximum:Straining pace; as fast as you can run.