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TSS, Relative Effort, Fitness Score... Confused by all the numbers and what they mean? Mike and Prof. Tucker delve into the details of what defines fitness, how it is measured, the factors that influence fitness and how apps like Strava utilise metrics to provide a fitness score. But what do all the numbers mean, and how can we use them to understand our training better, get fit and peak just at the right time for an event?

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