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Will running very high mileage actually make you a better runner? It can – but the main reason why it can isn’t what you’d expect. It won’t necessarily improve your aerobic or anaerobic threshold, VO2 Max or general fitness, but it will improve your ability to use fat as an energy source and this is key for racing a marathon.

The late physiologist Al Claremont claimed that high mileage helps you better utilise glycogen, the starchlike substance stored in the liver and muscles that changes into a simple sugar as the body needs it. Carbohydrates in our diet are our main source of glycogen – one reason spaghetti is such a popular pre race meal for marathoners. Glycogen is the preferred fuel for running, but your levels can become depleted within 60 to 90 minutes. Thereafter, your source of fuel is fat, which is metabolised less efficiently.

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