Kris Stallenberg 120-min Z2 (Endurance) Easy #04 This workout features two long, slow ramps entirely within your zone Z2 (Endurance) range. The gradual increase in intensity from the bottom to the top of the zone teaches pacing and control, reflecting the principles of Coggan Power Zones. This session is excellent for improving your ability to sustain power over long durations and for learning how different efforts feel within the same endurance zone. bike