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  • With no gravitational force to work against, your body not only doesn't need the same amount of muscle and bone, it starts breaking them down. As on Earth, so in space: use it or lose it. And exercise may not solve the problem.

    "Can We Make It To Mars?". "NOVA scienceNOW" with Neil deGrasse Tyson, www.pbs.org. January 19, 2011.