Find your target heart rate zones for fat burning, cardio and peak performance.
Target heart rate zones for effective training
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Training in different heart rate zones produces different physiological adaptations — and most casual exercisers spend too much time in the "moderate" zone that's neither great for fat burning nor for building serious cardiovascular fitness.
Zone 2 (60-70% max HR) is where most fat-burning and aerobic base-building happens — this is sustainable, conversational-pace exercise that builds your cardiovascular foundation. Most endurance athletes spend 70-80% of training time here, despite it feeling "too easy."
Zone 4-5 (80-100% max HR) builds speed, power and VO2 max but is unsustainable for long periods and shouldn't dominate your training — overdoing high-intensity work leads to burnout and injury without the base fitness Zone 2 provides.
Use the calculator above to find your personalized zones based on age, then aim for a mix — mostly Zone 2 for base fitness and fat burning, with 1-2 sessions per week touching Zone 4-5 for performance gains. This polarized approach outperforms constant "medium effort" training for most fitness goals.