In this episode of Fast Physiology on the Critical Oxygen Podcast, Dave Schell and I engage in a spirited debate about the utility and accuracy of physiological assessments, particularly ramp/step tests. We discuss the importance of understanding physiological variables, the differences between lab and field tests, and the value of physiological testing in tracking performance over time. We also discuss the nuances of physiological testing and how different types of tests can effect physiological outcomes. The conversation highlights the nuances of testing methods and the need for flexibility in training approaches.