Kris Stallenberg 60-min Z2 (Endurance) Medium #02 This session breaks up the endurance work into four manageable 10-minute blocks. The goal is to accumulate significant time in Zone 2, consistent with the principles of Coggan Power Zones for building aerobic endurance. The short one-minute recoveries allow for a mental reset, helping you maintain quality throughout the workout. The text cues introduce optional spin-ups to improve pedaling dynamics without leaving the target power zone. bike