The aim of our performance is ‘to show how gravity always wins’. With every situation eventually gravity will take place. In our case gravity will deteriorate the muscles sustainability in the body. Gravity affects the human body from our blood flow to our sense of balance. It is actually due to gravity why we have to exercise, ‘when astronauts are in micro-gravity, the muscles of the body that keep the torso up right don’t need to support the weight of the body, so atrophy (shrinking) occurs. This muscle wasting is similar to that which occurs to people on earth when they do not get exercise, such as when they are bed ridden’.

http://www.hsc.csu.edu.au/senior_science/options/space/2968/ss993.html