Kris Stallenberg 60-min Z2 (Endurance) Medium #04 Experience the full breadth of Zone 2 with this progressive endurance workout. The main 40-minute segment is a slow, steady ramp from the bottom to the top of the zone. This teaches pacing and control, forcing you to make micro-adjustments to stay on target. This type of training aligns with Coggan Power Zones by improving your ability to sustain power over long durations and enhancing your feel for different effort levels within the same zone. bike