World-class cyclists can sustain approximately 4 watts per kilogram of power output while keeping lactate below 2 mmol/L.

“What you showed that I just thought was so elegant was, as you said, you can either cap the output or clamp the power required or clamp the lactate production and look at the power required. And you did the latter. You basically said, we're going to find everybody's zone two, meaning we're going to find everybody's tipping point, at which point their mitochondria are no longer visible. high enough in function to meet the requirement. And what you showed was world-class cyclists were able to get to an average of something like 300 watts before they would finally flip that switch and have to start recruiting the fast twitch muscle fibers, which was measured indirectly by lactate production.”