Exercise is the number one health priority in space and it is so important for astronauts to exercise while they’re in space. To stay healthy in space, astronauts are scheduled to exercise for two and a half hours per day for six days per week. Most, however, exercise seven days per week. They perform both cardio and resistance exercises to keep their muscles and bones strong.

The theory was that a more stringent regimen of resistance training and interval aerobic exercise would help the astronauts stay fit while on the space station.

How does going out of the Earth into space affect the human body — its chemistry, physiology, biology and associated medical conditions? For example it takes about 300 days to reach Mars which is 57 million km at its closest from the Earth. How much bodily change can happen during this one-year trip? It was with these issues in mind that the National Aeronautics and Space Administration of the U.S. set up an experiment to test the changes that happen to various biological features in an astronaut, who will be stationed at the International Space Station (ISS) which is 400 km above, and completes multiple orbits around earth every day.

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