Pretty much the whole body is used for swimming, that is why it is such a good therapy sport. You will often hear physical theripists tell their athletic, or non-athletic patients to swim because it helps to relax all of the muscles as well as keep the patient in decent physical condition.
Bones when swimming are only used to keep the body shape, very little stress is put on the bones, if the only excercise you do is swimming and your elderly it is possible you will lose bone density !
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