Kris Stallenberg 120-min Z2 (Endurance) Medium #07 This workout breaks a long endurance effort into more manageable chunks with very short recovery periods. The goal is to accumulate a large volume of time in Zone 2, the key aerobic-building zone in the Coggan Power Zones model. These brief 'resets' at Zone 1 intensity allow for a quick mental and physical break, helping you maintain quality and power throughout the entire session. bike