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How Astronauts Exercise Without Gravity

Astronauts need to exercise to stay healthy in space, but how do they work out without gravity?

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Read More:
Your Body in Space: Use It or Lose It
http://www.nasa.gov/audience/forstudents/5-8/features/F_Your_Body_in_Space.html
Besides eating and sleeping, what do astronauts spend more time doing in space than anything else? It’s exercise.”

How Do Astronauts Exercise in Space?
http://www.pcmag.com/article2/0,2817,2422102,00.asp
“ARED (Advanced Resistive Exercise Device) was delivered to the ISS by Space Shuttle mission STS-126 in November 2008. Designed for weightlifting in a weightless environment, it consists of two evacuated, pistol-driven canisters with a flywheel mechanism.”

Cardiovascular System Gets ‘Lazy’ in Space; New Study Gets Blood Flowing on Station
http://www.nasa.gov/mission_pages/station/research/cciss_feature.html
“Every time we stand up, gravity pulls blood into parts of the body that are below the heart. A simple experiment you can do to prove this is to let your hand hang down for a short time then examine the veins in the back of your hand.”

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