We’re all chasing peak fitness. We want it on – not before, not after – the day of our highest priority race. Timing fitness is a top concern for athletes, and can quickly become a struggle without a solid understanding of a few important terms: TSS (Training Stress Score), CTL (Chronic Training Load), ATL (Acute…
![](https://www.trainerroad.com/blog/wp-content/uploads/2016/08/tss-ctl-atl-tsb-blog-feature-768x372.jpg)