Submariners cannot exercise while at sea. And there are various explanations as to why there is such a ban.
Amount of breathable air. This is the main reason why you cannot exercise on a submarine. After diving, sailors breathe artificial air, which is available in limited quantities and contains plenty of carbon dioxide. Therefore, in principle, breathing underwater is more difficult than on land. The journey itself may take several weeks or months.
Security regulations. Special procedures are implemented to ensure the safety of being on board during the voyage. If a person is distracted from sports, he may be late for any important action.
small space. When performing physical exercises on a submarine, you can accidentally damage equipment and harm other people.
Technical equipment. Since submarines do not have facilities for sports training, they can easily be damaged.
Source: Ferra
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