Kris Stallenberg 45-min Z2 (Endurance) Medium #03 Simulate rolling terrain with long, gradual ramps that fluctuate across your entire endurance zone. This workout enhances your ability to produce steady power on varied gradients. By staying within Z2 of the Coggan Power Zones, you'll build aerobic fitness and muscular control without accumulating excessive fatigue. Focus on maintaining a consistent cadence as the resistance changes. bike