Kris Stallenberg 45-min Z2 (Endurance) Medium #07 Enhance your endurance ride with short, high-cadence 'spin-ups'. The main body of this workout is steady Zone 2 riding, consistent with the Coggan Power Zones model for building aerobic base. However, each block concludes with a brief ramp to improve neuromuscular coordination and leg speed without leaving the aerobic state. This helps you become a more efficient and versatile rider. bike