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/