Running Explained - Should you "train by heart rate" beyond your easy zone? Not really; but you should know what is HAPPENING in your body when you're in those different zones, what
![Five-zone intensity scale: Intensity zones, running speed and type of... | Download Scientific Diagram Five-zone intensity scale: Intensity zones, running speed and type of... | Download Scientific Diagram](https://www.researchgate.net/publication/299400974/figure/tbl3/AS:827619582935040@1574331293115/Five-zone-intensity-scale-Intensity-zones-running-speed-and-type-of-training-lactate.png)
Five-zone intensity scale: Intensity zones, running speed and type of... | Download Scientific Diagram
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