Our project is a harness that one would wear in space to prevent the atrophy of muscles in one's core specifically the lower back muscles and the abs. There are two pieces on that is worn on the lower back and one that wraps around the butt and thighs. Elastics are attached to the both pieces and the elastics sort of simulate gravity. The elastics want to pull your upper body and lower body together so you are forced to use your core muscles to keep your upper and lower body apart. In space because there is no gravity one's muscles and posture begin to deteriorate because they are not be used. We decided we wanted to come up with a device that would passively stimulate one's core muscles so they don't deteriorate. This project is important because on average astronauts loose thirty percent of their muscle mass while in space and this beomes a health risk for them. Since astronauts loose so much muscle mass in space they are forced to spend two hours working out everyday, our project attempts to lessen the amount of time they have to work out because it forces them to passivly use their core muscles.