My uncle is a masters swimmer. Mel Goldstein. He once told me swimming is like your shoulders trying to run away from your hips while being chased by your feet. Or something like that. I can't remember the exact quote. Anyway, he wrote a book about his technique called Swimming Past 50. Check it out. I don't think it is in print, but I've been able to find a copy for others with a little searching. Supposed to be a good book but too advanced for me. No chapters on dog paddling or the perfect cannonball, which admittedly is sort of the antithesis of swimming.