Kris Stallenberg 90-min Z2 (Endurance) Easy #07 This workout builds aerobic endurance while incorporating specific cadence drills to improve pedaling efficiency. The main blocks are set in Z2 (Endurance) according to the Coggan Power Zones, providing the ideal stimulus for base fitness. Each block has a different cadence focus: normal, high (for neuromuscular speed), and low (for muscular force production). This combination makes you a more efficient and versatile rider. bike