Here's why the 5 zone training model isn't working anymore and what you should use to organize your training instead.

0:00 Background

1:00 Why 5 Zone Training Model Is Broken

2:00 Reason 1 - False Specificity 

4:06 Reason 2 - Runners Don't Have 5 Heart Rate Zones

7:19 Reason 3 - Heart Rate Training Is Fundamentally Flawed

9:55 The Three Zone Model

10:00 First Zone - Daily Mileage

12:55 Second Zone - Race Effort 

18:00 Third Zone - Speed 

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