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Originally Posted by Daffy Duck  I don't think anyone has ever developed a muscular body without any physical action |
Actually there is a scientific paper which indicates that people can increase their muscular strength, simply by visualising that they do gym workouts.
In future, one potential application of this research would be for bedridden patients. They can try to maintain their overall bodily strength through visualisation, even though some specific injury (eg a broken leg) is causing them to be unable to do actual physical exercise.