text: if swimming is so good for your figure, how do you explain whales?   yeah ... and they live on plankton and seafood which is totally healthy and has about 0 calories and 0 fat, but they're enormous.  contrast this with pythons, who gorge themselves on huge quantities of food, then spend days lying around sleeping it off. yet they are very svelte creatures.  i think the diet and exercise industry needs a huge shake-up! come on people, there's something we're missing here!