Kris Stallenberg 60-min Z2 (Endurance) Pushing #06 This session uses an ascending intensity structure. Begin with a long, steady block in mid-Z2 to build a foundation of fatigue, then progress to shorter, more intense intervals at the top of the Z2 (Endurance) range. This challenges your ability to hold good form and power as fatigue accumulates, a key principle of effective training within the Coggan Power Zones framework. bike