Your chair is killing you! A wake-up call to sedentary Americans. This groundbreaking new medical work demonstrates how modern sedentary lifestyles contribute to poor health, obesity, and diabetes, and how health can be dramatically improved by continuous, low-intensity, movement that challenges the force of gravity. Citing her original NASA research on how weightlessness weakens astronauts' muscles, bones, and overall health, the author presents a simple and effective plan for maintaining good health throughout life by developing new lifestyle habits of frequent gravity-challenging movement. Written for everyone who spends most of their lives sitting in chairs, at desks, and in cars, this practical, easy-to-follow action plan outlines simple gravity-challenging activities such as standing up frequently, stretching, walking, and dancing that are more healthful and effective than conventional diet and exercise regimens.