There is no need to swim at a swimming pool to train your shoulder muscles.
Try doing the swimming motion at home 700 times per day with just your body.
Even if you don’t get wet with even one drop of water, your muscles get exercised,
your physical constitution strengthens and gets trained.
If your brain develops, with ‘wisdom,’
you will use even a small sail boat as a battleship and use even a 35 sq ft piece of
land as a sports field.