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Prolonged exposure to low or zero gravity is dangerous for human beings. Without the pressure of one's own weight, your spine will straighten, your bones grow thin and brittle, and your muscles (especially the heart) atrophy and weaken. If you later return to normal planetary gravity, you are likely to be unable to stand up and will probably snap your own spine under your own weight if you try. However, in the mid-21st century, early Earth Fleet scientists developed medications called Grav Pills which can prevent these negative consequences if taken regularly, and of course all Earth Fleet and other military and civilian personnel who spend prolonged periods in space or in zero-g are prescribed courses of these drugs.