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.
Collection
[
|
...
]