Kris Stallenberg 60-min Z2 (Endurance) Pushing #10 Keep your body and mind guessing with this mixed Z2 (Endurance) session. It combines a long steady-state block, sharp over/unders, and a finishing ramp to provide a varied aerobic stimulus. This workout touches on multiple ways to build endurance within the Coggan Power Zones, making it a comprehensive and engaging challenge. bike