Glossary: Chronic Training Load (CTL)

Chronic Training Load represents your current degree of fitness, being an exponentially weighted average of your training load (i.e. TRIMP) over a period of 42 days by default.

Similar to ATL, Runalyze uses the alltime maximum CTL to express current CTL as percentage.

See also


  1. Calvert, T. W., Banister, E. W., Savage, M. V., Bach, T.: A Systems Model of the Effects of Training on Physical Performance, IEEE Transactions on Systems, Man, and Cybernetics, volume SMC-6, issue 2, 1976, pp. 94–102, doi 10.1109/TSMC.1976.5409179
  2. - Modeling Human Performance
  3. The Training Stress Balance model by Andrew Coggan

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