Would a knights armor-plated, sword-wielding, battle-hardened physiology have been better suited to Zone 2 training than our modern-day, lycra-clad, gel-filled water bottle-toting physiques, and if so, would their jousting tournaments have been the equivalent of our modern-day endurance rides, with the added bonus of a face-full of lance and a potential trip to the afterlife if they failed to maintain a steady state heart rate.
Did the knights of yore unknowingly stumble upon the perfect Zone 2 training protocol, with their aerobic base built up from hours of marching in heavy armor, and their lactate threshold pushed to the limit by the intense, short bursts of energy required to charge into battle, and if we were to adopt a similar training plan, would we see a significant improvement in our own endurance capabilities.
Or are we just romanticizing the past, and the idea that knights were somehow more suited to endurance exercise than we are today, when in reality they were probably just as prone to fatigue, injury, and saddle soreness as the rest of us.