The traditional model of running physiology had 3 elements: VO2 max, lactate threshold, and running economy. 

But in recent years, a 4th element has been brought to the table, 'physiological resilience', or durability. 

Brady Holmer walks us through what it is, why it matters, how we can improve it, and why Kipchoge is the king of physiological resilience.

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00:00 - defining physiological resilience
02:56 - examples of excellent physiological resilience (Kipchoge)
04:40 - the 3-factor model for endurance
07:33 - how to measure physiological resilience
09:48 - can we train our durability?
14:14 - who might want to focus on durability training?
17:30 - super shoes and durability
18:51 - race day techniques to improve durability
20:00 - how you should think about physiological resilience