GravityDumbbells

The Gravity Dumbbell is for combating bone density loss in the arms. In each of the hollow ends, there is an axle with a iron weight attached to it. Astronauts take the middle handle of the dumbbell and start swinging it in small, fast circles. Then they stop swinging it and try to keep their arm steady while the weights in the dumbbell spin. The spinning weights create their own rapidly changing gravity.

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