This episode we look into the published literature on the surprisingly tight agreement between FTP and RPE and a couple different lab-derived measures of threshold like MLSS and critical power, along with the concept of anchoring. But first we get philosophical about how measurements often become definitions that can lose sight of our valid observations and experience. We wrap up by discussing FTP testing with RPE, plus answer your listener questions on RPE scales and anchors, RPE drift, common mistakes when using RPE, Borg's 6-20 vs 10 point scale, and much more.