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What is PMC? How to Balance Your Fitness, Fatigue, and Form? The Performance Management Chart (PMC) is a powerful tool that helps you plan and track your training at the Training Peaks platform. It allows you to balance your fitness, fatigue, and form to achieve your best performance. PMC calculates your Training Stress Score (TSS) based on the duration and intensity of each workout and uses this data to determine fatigue (ATL - 7-day average) , fitness (CTL - 42-day average) , and form (TSB - fitness minus fatigue) . This visualization helps you understand when to push harder and when to rest to be in peak condition for race day. Let's take a closer look at how to use these metrics effectively. What is Training Stress Score (TSS)? Everything starts with a  Training Stress Score (TSS) . Each workout receives a stress score based on its duration and intensity. For example, a short but intense session will have a different TSS than a long but moderate one. TSS is calculated using th...