Sitting Kills, Moving Heals is the title of a book by exercise physiologist Dr. Joan Vernikos. Her argument—one that has been confirmed by other scientists in a new field called “inactivity physiology” is not that sitting is necessarily bad for us; just that we spend far too much time doing it. The real problem is inactivity. Or put another way, it’s the absence of moving against gravity in a variety of ways throughout the day. Moving in opposition to gravity stimulates certain cell functions we need to be healthy, and we need to move frequently throughout the day. An hour at the gym after work won’t cut it. Dr. Vernikos became an expert on the physiological effects of gravity while working with NASA, where she observed the health-damaging effects of weightlessness on astronauts. Living in a gravity-free environment, she says, accelerates the aging process by about ten times. Changes in muscle and bone and other detrimental physiological changes that ordinarily occur in one ye…