Also on board is a new exercise machine, which is part of ongoing studies into the effects of long-term space flight on muscle and bone loss in astronauts.

VOA: standard.2010.04.05

It will also store a treadmill the crew must use regularly to exercise their bodies and maintain bone density.

BBC: Shuttle Endeavour launches from Florida

After three years, those in the exercise therapy group had maintained their bone density, unlike the small control group that was inactive.

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Anaerobic exercise (weight or strength training) helps form bone density and builds muscle that more efficiently burns calories.

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