The Role of Time in Training

There is a time component to this. When you look at zone one, zone two, the training stimulus isn't high, but it's over time. The lab studies were biased methodologically by the concept of equating total work. You're not going to take somebody off the couch who's just trying to improve their health and say, oh, go out and do a four or five hour bike ride. They don't have an hour in the gym. And so there's a bias there that also has influenced things.