Harvard paleoanthropologist Dan Lieberman chats with Trey Elling about EXERCISED: WHY SOMETHING WE NEVER EVOLVED TO DO IS HEALTHY AND REWARDING, including: how our activity levels compare to primates and modern hunter/gatherers, whether sitting is the new smoking, the legitimacy of ten-thousand steps and eight hours of sleep, the benefits of walking, running, and resistance training, how exercise can help with cancer and mental health issues, and more.