“Even though there were long periods of inactivity, the Hadza are often resting in postures that require their muscles to maintain light levels of activity,” explains professor and researcher David Raichlen, Ph.D. “Being a couch potato—or even sitting in an office chair—requires less muscle activity. Since light levels of muscle activity require fuel, which generally means burning fats, then squatting and kneeling postures may not be as harmful as sitting in chairs.”