Kris Stallenberg 30-min Z2 (Endurance) Medium #07 Develop pedaling efficiency while building your aerobic base. This workout features a solid 20-minute block in Z2 (Endurance), with prompts for brief, high-cadence spin-ups. These drills help improve neuromuscular coordination without elevating your effort out of the target zone defined by the Coggan Power Zones. Focus on staying smooth and relaxed, even as your leg speed increases. bike