Kris Stallenberg 75-min Z2 (Endurance) Pushing #03 This workout uses a graded approach to Zone 2 endurance training. Each of the three 18-minute blocks progressively increases in intensity, moving from the lower to the upper end of Z2. This structure challenges your body to adapt to increasing demands while maintaining an aerobic state. Referencing the Coggan Power Zones, this helps build deep endurance and teaches pacing by feel. The short recoveries demand you stay engaged throughout the session. bike