How to Use the ‘80/20’ Rule for Running

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Runners often swear by the 80/20 rule for organizing their training—but there's no relation to the Pareto principle of the same name. Let’s talk about where the 80/20 idea comes from, how to implement it, and when it is and isn’t a good idea to train this way. 

What is the 80/20 rule for running? 

Briefly, it’s the idea that 80% of your running should be low intensity, and only 20% at medium or high intensity. Recreational runners...