Kris Stallenberg 90-min Z2 (Endurance) Medium #07 This session features descending endurance blocks, starting at the higher end of Zone 2 and gradually decreasing the intensity. This 'front-loads' the effort, challenging you to hold a strong pace early on. As fatigue builds, the power target drops, allowing you to maintain good form and pedaling mechanics. This method of training within the Coggan Power Zones builds a robust aerobic foundation. bike