Kris Stallenberg 120-min Z2 (Endurance) Medium #10 This is a progressive endurance ride that increases intensity in the second half. You'll start in the lower end of Zone 2 and finish in the upper end, teaching your body to handle a rising effort over a long duration. This aligns with the Coggan Power Zones by building fatigue resistance and simulating the feeling of a long ride where the pace naturally lifts. It's a great workout for building a deep aerobic base. bike