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Originally Posted by Buddy  As long as you are sound structurally I'd always pick an exercise with natural gravity-running. It's like if someone is in space for a long time. They start to lose bone density. We NEED gravity to function in these bodies. |
That's half right. Swimming shouldn't be your only exercise because you'll lose BMD (bone mineral density) just swimming, that's why many swimmers do strength training. Studies have also shown that swimmers have the lowest BMD.
But swimming is a very good exercise, along with running.