First, Peter B., thanks for asking us about intervals. We hope our dissection of the dreaded 4x8s is helpful! Enjoy Trevor’s graphs & analysis. Next, David S. brought up a really good point: How do you adequately train for Dirty Kanza, when you live in an area that doesn’t offer the rugged terrain you’ll be faced with on race-day? Finally, Jeremiah B., you know we love to talk about when to train in Zone 1, Zone 2 & so on, in the polarized model. Thanks for your question about cardiac drift.

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