5k + Duathlon + Triathlon : Tracking your improvement (or not) with TRIMP CTL TSB ATL

I think I’m a contender for the award for the post with the most previously unheard of acronyms in the title. These acronyms being TRIMP : CTL : TSB : ATL Essentially they help you broadly understand  the effect of your training on your body. Answering questions like: “Am I really improving?”; “Am I too…