If you have ever opened TrainingPeaks, stared at your Performance Management Chart and thought "what on earth am I looking at," this one is for you. I wanted to strip the jargon out of four letters that get thrown around constantly — TSS, CTL, ATL and TSB — and show you how they actually connect to the way your body feels on the bike.
The short version: TSS tells you the cost of a single ride. CTL is the rolling average of that cost over about six weeks, so it tracks your fitness trend. ATL is the same idea but over seven days, so it tracks your recent fatigue. And TSB is the gap between the two — positive means you are fresh, negative means you are carrying load. That is it.
The mistake most riders make is obsessing over absolute numbers. A CTL of 80 does not automatically mean you are fit, and a TSS of 200 for a single ride does not automatically mean you trained well. What matters is the relationship between the lines and how those trends match up with how you actually feel. If your PMC says you should be fresh but your legs say otherwise, trust your legs. The chart is a tool, not a coach.
I also talk about the ramp rate trap — when riders see CTL climbing they want to push it higher and faster, but a ramp rate above five to seven points per week is where most amateurs start getting ill or injured. Slow and boring wins.
If you want to talk through your own data with other riders who are figuring this out too, come and ask questions in the community.
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