Kris Stallenberg 120-min Z2 (Endurance) Easy #03 This workout uses a pyramid structure to build time in zone Z2 (Endurance). The intervals progressively lengthen and then shorten, challenging your focus and stamina. This approach, based on Coggan Power Zones Level 2, is excellent for building mental toughness for long events. The short active recovery periods allow for a brief mental and physical reset before the next block. bike