Kris Stallenberg 45-min Z2 (Endurance) Medium #01 This workout establishes a solid aerobic foundation with a prolonged, steady effort in your endurance zone. The main set is a continuous 35-minute block in Zone 2, designed to improve your body's ability to utilize fat for fuel and build muscular endurance without significant strain. This type of training is fundamental in the Coggan Power Zones framework for building a deep base of fitness. Focus on maintaining a smooth, consistent pedal stroke throughout. bike