Banister : the model behind CTL/ATL/TSB
LoadThe mathematical model that computes fitness/fatigue/freshness from your TSS history.
Eric Banister proposed in 1975 a model where each session leaves two imprints: a long-decay one (fitness) and a short-decay one (fatigue). Today's freshness = fitness − fatigue. It's the foundation of every modern tool (TrainingPeaks, intervals.icu, TriPaced) using CTL, ATL, TSB.
In TriPaced:
TriPaced reimplements Banister from your actual Strava activities, not an estimate. The initial seed (before your first imported activity) starts from a conservative value tied to your declared archetype.
Source Banister, Calvert, Savage & Bach, 1975 : A systems model of training for athletic performance