Kris Stallenberg 60-min Z2 (Endurance) Pushing #07 The ultimate test of Z2 (Endurance) focus. This workout involves a single, extended 45-minute interval at a steady state. The primary challenge is mental discipline and maintaining consistent output. In-ride prompts will guide you through cadence changes to explore different pedaling mechanics and muscle recruitment patterns, all within the Z2 principles of the Coggan Power Zones. bike