Zone 2
Informal label for lower aerobic intensity near easy endurance work.
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8 answers for “Zone 2”
Aerobic fitness
The ability to use oxygen-supported energy systems to sustain repeatable cardio, sport, and conditioning work.
Open answer →Fasted cardio
Cardio done after an overnight fast or long gap without food, often promoted as a shortcut for burning more body fat.
Open answer →Steady-state cardio
Continuous aerobic work held at a fairly stable effort instead of repeated hard bursts and recoveries.
Open answer →Ventilatory threshold
A breathing and gas-exchange intensity landmark used to estimate when easy aerobic work becomes harder endurance stress.
Open answer →Long slow distance
Easy or mostly easy endurance work done long enough to build repeatable aerobic volume without turning the run into a race.
Open answer →RIR
Reps in reserve: how many good reps you likely had left at the end of a set.
Open answer →Threshold training
Controlled hard endurance work near the upper edge of sustainable effort, usually used for tempo runs, cruise intervals, and race-specific aerobic fitness.
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