Kris Stallenberg 45-min Z2 (Endurance) Pushing #05 Primarily an endurance ride, this workout includes very short Tempo Teasers into Z3. These brief surges mimic small rollers on a ride, forcing your body to quickly clear lactate and settle back into an aerobic rhythm. It's a hard Z2 session that sharpens your aerobic system, staying true to the principles of Coggan Power Zones by using targeted, brief over-threshold efforts. bike