Kris Stallenberg 45-min Z2 (Endurance) Easy #01 This workout is a foundational aerobic endurance session designed to improve your metabolic efficiency. By holding a steady state in Z2, as defined by Coggan Power Zones, you encourage your body to become better at utilizing fat for fuel. This is the cornerstone of building a deep and resilient aerobic base. Focus on maintaining a smooth, consistent pedal stroke throughout the main block. bike