Fitness
Zone 3 Training
Zone 3 training is moderate-hard cardio that builds endurance but can crowd recovery if it dominates the week instead of true easy and hard days.
Zone 3 training is moderate-hard aerobic work—often roughly seventy to eighty percent of max heart rate—where conversation needs broken sentences. It builds muscular endurance and cardiac stroke volume but can become a gray zone if most weekly volume lands here instead of easier zone 2 or harder intervals.
Polarized plans limit zone 3 to targeted blocks.
Common questions
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Is zone 3 training junk mileage?
Not junk—it's productive when dosed. Problems appear when almost every run or ride sits in zone 3, leaving no easy recovery or sharp top-end stimulus.
Related terms
Put Zone 3 Training into practice
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