Kris Stallenberg 90-min Z2 (Endurance) Easy #05 This workout uses a pyramid structure to vary the effort and keep the session engaging. The blocks build in duration and then taper off, all while staying within the Z2 (Endurance) range defined by the Coggan Power Zones. This challenges your ability to maintain focus and control over different durations, enhancing your overall aerobic conditioning. The short recoveries are just enough to reset before the next block. bike