Funny thing, I was just talking to my buddy this morning about a marathon he ran over the weekend. For him, when running, he starts thinking about everything else and tunes out the pain below his waist.
Way back when I was in the service, I would think about the ladies I would go out with that night when doing 50+ mile roadmarches. I know, not quite swimming, but still, worth mentioning for the mental states people get into when performing strenuous exercises.
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