Phil Maffetone could well be called the "prophet of Zone 2".  He's been writing, speaking and coaching the importance of aerobic base since the early 1980s.  During  a chance meeting with Phil in 1984 Uphill Athlete co-founder Scott Johnston was first exposed to the importance of low intensity training.  In this episode, Scott talks with Phil, originator of the concept of aerobic deficiency. In this discussion they trace the arc of Scott’s training philosophy from that chance meeting in 1984 to the current Uphill Athlete training methodology.