Zone 2 Myths, Heart Rate vs. Effort, Heat Training, and Zone 3 with Brady Holmer - Strength Running
Briefly

The flexibility of heart rate zones and their impact on training adaptations. Physiology is constantly fluctuating: zones aren't static. RPE (rating of perceived exertion) is a valuable metric for runners.
The 80/20 rule of running: 80% lower intensity and 20% higher. Benefits and nuance of Zone 2, Zone 3, and Zone 4. Zone 3 training is complicated, but not pointless.
Read at Strength Running
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