The Consistently Good Podcast S2E3: Why Critical Velocity Training is Pure Magic
Mar 4, 2026
A coach explains how a specific pace-based training method builds speed and extends endurance without excessive fatigue. The conversation covers its scientific origins, why it reliably produces gains, and where it fits among other training types. Practical details include how to calculate the pace, typical workout structures, volume guidelines, and when to include these sessions in a training block.
AI Snips
Chapters
Transcript
Episode notes
How Jeff Accidentally Found Critical Velocity
- Jeff Cunningham discovered critical velocity by accident while coaching high schoolers and called the early sessions "cruise intervals."
- He iterated from trial and error in the early 2000s and later matched his observations to published work by Vigil and Daniels.
Critical Velocity Hits Two Systems At Once
- Critical velocity trains both fractional VO2 utilization and moves lactate threshold without full VO2 or LT workouts.
- That middle zone improves extensibility so athletes can run faster for longer without excessive fatigue.
Critical Velocity Converts Malleable 2A Fibers
- Critical velocity most effectively converts type 2A (malleable) fibers toward more aerobic function.
- Dr. V. Hill places it around 89–94% of MVO2, which targets type 2A aerobic adaptations and mitochondrial respiration.