48: Is It Bad to Run in the "Grey Zone?" Understanding Moderate Pace Running

What is the grey zone in running?

The benefits and detriments of running in the grey zone

How to use the talk test 

When to use zone 3 training

Should you do all of your long runs at marathon pace?

What is polarized training (hard days hard, easy days easy)

Marathon pace/zone 3 workouts

Zone 2 vs zone running when you are a beginner runner

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44: Why do you get muscle cramps when running?

9: What is 80/20 running?

2: Zone 2 training and heart rate

32: What your running watch stats mean

References: 

PMID: 33344993

PMID: 36900796

PMID: 35661059

PMID: 26578968

Skiba, Scientific Training For Endurance Athletes

https://www.frontiersin.org/articles/10.3389/fspor.2019.00070/full

Further reading: 

https://lauranorrisrunning.com/what-is-zone-2-training/

https://www.runtothefinish.com/zone-2-heart-rate-training/

https://www.runtothefinish.com/running-heart-rate/

https://lauranorrisrunning.com/training-intensity-distribution-for-runners/