Legs become thinner and thinner as time passes. The muscles of the legs push fluids and blood upward, which decreases the size of the thighs and calves. The waist becomes smaller by 3 to 5 inches due to an upward shift of the internal organs. The body grows 1/2 to 21/4 inches taller because the spine lengthens and straightens. Relaxed body posture in space is head tilted backward, shoulders up (like a shrug) and arms afloat, up and forward with hands chest high. Loose flesh rises, giving the face a high-cheekboned look. Bags appear under the eyes, veins in the forehead swell, and the whole face looks puffy. At first the body feels lightheaded and nauseated, or sick to the stomach. After a few days these feelings go away, but a full-headed feeling (like hanging upside-down) remains. Photo of astronaut Michael Hopkins courtesy of NASA
