The Consistently Good Podcast · Bare Performance Nutrition

S2E3: Why Critical Velocity Training is Pure Magic

·51 min·2 clips

I don't want to hear about the labor pains. Just shut up. I don't want to hear the baby.

He starts with conviction. Jeff Cunningham says critical velocity has been central to the way he has coached for 25 years, and he frames the conversation as a practical answer to a simple question: how do you help runners get as fast as they can get without turning training into a rigid spreadsheet? The answer is coaching judgment. He says the point is not just to quote a pace, but to understand the why, the how, the science, and the art around the numbers so the work actually pays off on the track and in the race. He keeps the pace grounded. In his view, critical velocity sits around 89 to 94 percent of max VO2, and he pushes back on the more conservative ceiling some scientists and coaches prefer because athletes do not all respond the same way. That range matters. He draws a clear line between runners who are naturally snappy and those built more for holding pace, saying the second group often needs a different approach than the pure sprint types. Listen, not everybody is built the same. He moves from the 100, 200, 400, and 800 meter world into the longer lanes of the 5K, 10K, half marathon, and marathon, so the listener can hear why the same training idea lands differently across events. He does not want athletes cooked. If the work gets too close to 100 percent of max VO2, he says, the nervous system can get fried and the athlete ends up beaten up instead of sharpened, which is why the sweet spot matters so much. That is the whole trick. He argues that the right dose can wake up fibers that have not been asked to contribute enough and help them behave more like the durable fibers needed for longer efforts. The coaching voice stays blunt. He keeps circling back to real training blocks, real residual fatigue, and real race-day results, which makes the argument feel like something earned over hundreds and thousands of athletes rather than something borrowed from a textbook. And then he gets bigger. Near the close, he widens the lens to Boston qualifying standards, saying the faster the field gets, the more those qualifying marks may keep dropping, and that the only sensible response is to keep training hard and keep leaning into the work. No magic tricks, just work. He finishes the way he started, with a charge to stay consistently good and keep chasing down goals and dreams.

As heard by us

A coach's case for critical velocity, shaped by experience, science, and judgment.

Jeff Cunningham treats critical velocity paced workouts as a practical coaching tool, not a fixed prescription. He leans on 25 years of coaching, walks through the numbers and the science, and still leaves space for judgment when an athlete does not fit a neat formula.

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Why you'd press play

Want a coach's plain-spoken case for critical velocity and the 89%-94% range? Start here.

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