Cardiovascular champions: Thoroughbreds have huge hearts relative to their body size, with highly efficient cardio systems. Their hearts pump a large volume of oxygen-rich blood to their muscles, allowing them to sustain high speeds for extended periods and recover quickly after exertion.
Skeletal superstars: Thoroughbreds have long, slender legs and lightweight skeletons, which minimize the strain on their bodies while maximizing stride length and efficiency. Their long limbs and flexible joints enable them to cover ground quickly and smoothly, reducing energy expenditure and fatigue.
Heavy breathers: Thoroughbreds have large lungs and efficient respiratory systems, allowing them to take in and process large volumes of oxygen during intense exercise. As a result, they’re able to maintain aerobic metabolism and sustain high speeds over long distances without tiring quickly.