Zone 2 Training

Definition

Steady aerobic exercise at 60-70% of max heart rate, sustainable for extended periods. It's 'easy' cardio that builds your aerobic base without destroying you.

Example Usage

I spend three sessions per week doing Zone 2 treadmill running to build aerobic capacity without risking overtraining.

Origin

Heart rate zone classification system; formalized in endurance and sports science.

Fun Fact

Elite endurance athletes spend ~80% of their training time in Zone 2, focusing on building aerobic capacity rather than speed.

Source: Endurance training science and sports cardiology

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