This session represents Protocol 2 – Activation in pure form. The objective was not speed but density: expanding aerobic capacity through controlled climbing and disciplined heart rate management. Average HR of 137 bpm during a 1,300 ft ascent demonstrates improved cardiovascular efficiency relative to terrain demand. Zero anaerobic load confirms metabolic control. Garmin did not calculate VO2 Max due to grade variability and extended hiking segments; however, physiological markers suggest improved fat oxidation stability and reduced cardiovascular drift under elevation stress. This session strengthens: • Mitochondrial density • Stroke volume efficiency • Climbing economy • Musculoskeletal durability • Long-duration metabolic resilience Net impact was constructive stimulus without excessive recovery burden. This is foundational engine work that compounds over months.