WHAT DOES HE KNOW? is a short, direct book about the difference between producing performance and actually understanding it. David Lipscomb—Coach David—draws from nearly twenty years of bicycle racing, more than thirty years of coaching, and decades as a black belt martial artist to explain how he sees performance differently. This is not a training manual or a collection of workouts. It is a coaching philosophy built around control, timing, cadence, power, confidence, data, decision-making, and execution. Coach David argues that the number is only the result. The real advantage is understanding how you created it, what it cost, and whether you can reproduce it when it matters. Through 25 short chapters, he explains why stronger is not always better, why data is evidence rather than the answer, and why great coaching should ultimately teach athletes to think for themselves. At the center of it all is one principle: It is not how fast you go. It is how you go fast.