> Also, lighter bodies (relative to size) make us (in our natural form) extremaly capable long distance runners. Humans' ability to run long distances effectiv

> Also, lighter bodies (relative to size) make us (in our natural form) extremaly capable long distance runners. Humans' ability to run long distances effectively is due to a combination of factors, with the ability to sweat being one of the most crucial. Here are the key adaptations that make humans good endurance runners: a) Efficient sweating: Humans have a high density of sweat glands, allowing for effective thermoregulation during prolonged exercise. b) Bipedalism: Our two-legged gait is energy-efficient for long-distance movement. c) Lack of fur: This helps with heat dissipation. d) Breathing independence from gait: Unlike quadrupeds, our breathing isn't tied to our running stride, allowing for better oxygen intake. Lighter bodies (relative to size) plays a role but there plenty of creatures that have light bodies relative to size that are not great at long distance running.