Kris Stallenberg 75-min Z2 (Endurance) Medium #02 Experience gentle 'waves' of power within your endurance zone. This workout introduces subtle variations in intensity to improve your ability to handle small changes in pace or terrain while staying aerobic. Referencing the Coggan Power Zones, we'll keep the effort squarely in Zone 2, enhancing your fatigue resistance and building a solid aerobic engine. Stay smooth as the power drifts up and down. bike