Companies like Richard Branson's Virgin Galactic and Jeff Bezos' Blue Origin are gearing up to send tourists to the edge of space - and eventually, beyond - as soon as 2022. But for ordinary citizens, zero gravity and long flights could wreak havoc on their bodies. Getting to space is a naturally challenging experience, especially for the human body. That's why the firms hoping to sell trips are taking a page from NASA's playbook and undertaking a rigorous training program for would-be travelers to mitigate things like muscle atrophy and bone loss that studies show can happen on trips outside the atmosphere.
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