Dr. Will O'Connor takes us through the nuances of using running power in training. Will and Dirk get into the scientific side of power meters, discuss the accuracy and data consistency from devices like Stryd and other wearables, and learn how to use critical power zones to break down the metabolic costs of running variable terrain. Will also touches on some of the lessons in his Fundamentals of Running Power TrainingPeaks University course. Will is a running scientist and former triathlete based in New Zealand. He drew on his background in organic chemistry to complete a Ph.D. in Sport & Exercise Science from Massey University, where his research investigated metabolic flexibility and ketogenic diets in ultra-endurance performance. Will competes at the elite level in ultrarunning events — he's used a run power meter since day one — and is a coach and host of the "Running with Dr Will" podcast.