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I concur. Once, still very young, during my high school years I swam in competitive levels. Eventhough I was not the sharpest fool, I've never felt such an extended sense of 'pleasurable exhaustion' per se. But, When I run for five miles or so, I feel great but not as great as if I'd have swum four or five laps in an Olympic pool (I believe each are built using the exact same measurement).
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