[Noumenon72]

A 2019 article in Scientific American suggested that the Hadza example shows our bodies are adapted to require lots of exercise without paying a metabolic cost for it:

> Our bodies are evolved to require daily physical activity, and consequently exercise does not make our bodies work more so much as it makes them work better. Research from my lab and others has shown that physical activity has little effect on daily energy expenditure (Hadza hunter-gatherers burn the same number of calories every day as sedentary Westerners), which is one reason exercise is a poor tool for weight loss. Instead exercise regulates the way the body spends energy and coordinates vital tasks.

They compare the human need for exercise to the evolution of ram ventilation in sharks. By developing a system based on the assumption of constant movement, you become a more efficient forager. But if you stop moving, you die.

https://www.scientificamerican.com/article/humans-evolved-to...