The internet loves to dunk on easy runs right now. I keep seeing “hybrid athlete” takes that say if you lift and run, slow miles are a waste of time and you should just smash intervals, hills, and tempo because it’s “more efficient.” In this video I break down why that’s backwards for real endurance progress—especially if you want to run far, stay healthy, and actually keep improving year after year. I walk through the physiology that gets ignored in those hot takes: how easy running builds your aerobic base, supports mitochondrial development, and helps you stack consistent volume without blowing up your joints and tendons. I also talk about VO₂ max in context—yes, hard sessions matter, but they’re the spice, not the whole meal. There’s a reason elite runners still spend roughly 80–90% of their training at easy pace: it’s the foundation that makes the fast stuff work, and it lowers injury risk so you can keep showing up. If you’re balancing strength training with running, the takeaway is simple: don’t skip easy runs—use them to recover, build capacity, and earn the right to go hard.