Determining training load—whether for a given workout or a training block— isn't as straightforward as it seems. There is a veritable alphabet soup of measurements out there, including NP, TSS, IF, CTL, ATL, and TSB (just to name a few). Coaches Neal Henderson and Mac Cassin take a look at the different ways of measuring training load to help you better navigate the sea of acronyms and get a deeper sense of just how hard (or easy) those upcoming workouts might be.