TSS (Training Stress Score)
Definition
Training Stress Score (TSS) is a single number that quantifies the training load of a workout by combining duration and intensity. Developed by Andrew Coggan and Hunter Allen for cycling, now used across sports.
Why it matters
TSS allows you to compare the stress of wildly different workouts on a common scale. A 60-minute easy run might score TSS 40, while a 3-hour hard ride scores TSS 250. Summing daily TSS gives weekly load.
How FlipMP uses it
FlipMP calculates TSS for every synced workout across all sports. Power-based TSS uses actual power data. Heart rate-based TSS (hrTSS) uses heart rate data. The combination feeds into your CTL and ATL calculations.
Put this knowledge to work
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