Another angle so as not to parrot other comments: we’re biologically pretty bad at swimming compared to jogging, cycling, or throwing things. It’s a very inefficient mode of transportation for humans, so intense swimming generally puts more strain on the whole body than something we’re more evolutionarily favored to do, like walking.
Less generally, swimming has the added benefit of NOT putting strain on common exercise pain points, like knees and other joints in the legs.
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