Kris Stallenberg 75-min Z2 (Endurance) Pushing #01 This workout focuses on building a strong aerobic base by holding sustained power at the upper end of your endurance zone. The two long, 28-minute blocks are designed to improve muscular endurance and fatigue resistance. According to Coggan Power Zones, this session targets Zone 2, which is crucial for developing your all-day power. The challenge here is mental as much as physical; stay focused and maintain a smooth, consistent pedal stroke. bike