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In zero gravity, regular exercise is essential. Orientation of the body is of no concern when using exercise equipment, but it is important to provide body restraints designed for each exercise.
Prolonged exposure to weightlessness leads to progressive atrophy of leg muscles and an overall decrease in muscular capability.
This deterioration cannot be averted but it can be minimized by a regular program of exercise.
Incidentally heavy exercise too soon after a meal causes belching and regurgitation. The treadmill, the ergometer, and various spring devices are effective methods of exercise.
Frequently, a loose object drifts about the space vehicle but rarely causes physical injury, bruising, or even a sense of heavy contact when occasionally one brushes or bumps against such an object.