On this podcast episode I’m joined by Alex Hutchinson, an author and journalist based in Toronto. Alex writes regularly for the Sweat Science column in Outside Magazine where he focuses on the science behind endurance exercise. He’s also the author of the book 'Endure: Mind, Body, and the Curiously Elastic Limits of Human Performance'. We’re discussing Kipchoge’s sub-2 hour marathon, the role of mindset in performance sports, how we should interpret all the training metrics available to us, and different training methods including heart rate training and polarised training.