Maybe you've noticed (or maybe you deliberately ignore) the acronyms and corresponding numbers that appear within your TrainingPeaks app: TSS, CTL, ATL, and TSB. What are these metrics, and should you ...
In March, I ran my second fastest marathon. I had trained harder than I had ever trained before, but according to my Garmin Fenix 6x—which I was using for the first time during this training ...
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