Kris Stallenberg 75-min Z2 (Endurance) Pushing #06 This session features descending interval lengths at a steady Zone 2 intensity. Starting with a long 25-minute effort, the blocks get progressively shorter. This structure provides a mental boost as you tick off each interval. The focus, as per Coggan Power Zones, is on accumulating significant time at a productive aerobic intensity to enhance fat metabolism and muscular endurance. The challenge is to maintain the same high-quality effort from the first minute to the last. bike