Kris Stallenberg 120-min Z2 (Endurance) Pushing #08 This session uses a pyramid structure to vary the intensity and duration of efforts, all while staying grounded in Z2 endurance work. You'll build up to a long, challenging interval at the top of your Z2 and then work your way back down. This format keeps the workout engaging and simulates a long ride with a single, major effort in the middle. It's a great way to build sustained power according to Coggan Power Zones principles. bike