" following a strength-training program featuring natural, total-body movements (squats, pushups, pull-ups, etc.) helps you develop and maintain lean muscle mass, increase metabolism to maintain low levels of body fat, increase bone density, prevent injuries, and enjoy balanced hormone and blood glucose levels. "

― Mark Sisson , The Primal Blueprint: Reprogram Your Genes for Effortless Weight Loss, Vibrant Health, and Boundless Energy