Kris Stallenberg 45-min Z2 (Endurance) Medium #02 This session breaks down the endurance work into manageable 7-minute blocks at the upper end of Zone 2. The short recovery periods allow for mental resets and help maintain quality throughout the workout. This structure is excellent for improving aerobic efficiency as described in the Coggan Power Zones model. The goal is to accumulate significant time in Z2 while practicing smooth transitions between efforts. bike