Kris Stallenberg 120-min Z2 (Endurance) Easy #09 This workout introduces very gentle 'over/unders' to your endurance training. You'll spend two minutes just over the Z2 boundary in low Tempo, followed by two minutes in mid-Z2. The average power remains firmly in zone Z2 (Endurance), consistent with Coggan Power Zones. This variation helps improve your body's ability to clear lactate and handle changes in pace, all while staying within an aerobic, endurance-focused session. bike