Is managing recovery/fatigue just by TSS accurate enough?

My personal experience is that TSS does not reflect how I feel, especially after anaerobic or above threshold workouts.
On the other hand, Garmin’s training load seems pretty good so the Garmin’s 4 weeks timeline of acute and chronic loads is useful to me, even when I mix multiple sports (running, tennis, etc…). Recovery time is more of an awareness of where you are so you can plan accordingly. I don’t think Garmin says that you shouldn’t train if you are not fully recovered or if you have many hours of recovery time left, especially if you know a rest day or recovery week is behind the corner.

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