Kris Stallenberg 90-min Z2 (Endurance) Pushing #07 This 'Criss-Cross' workout elevates traditional Z2 (Endurance) training by adding very short, sharp bursts of VO2 Max power. The goal is to challenge your aerobic system's ability to recover quickly from a hard effort while remaining under load. This mimics the demands of surging over a small roller or closing a gap. By stressing the system in this way, you improve lactate clearance and overall aerobic fitness, all while adhering to the principles of Coggan Power Zones. bike