hi all - a question. i'm considering a marathon swim of 20 miles next july, and believe I can put in the training to be successful at it (prob 11 hours in the water). My concern is this: i've lived the last few years at 200 feet elevation and the lake is at 6000 ft. I'm sure in the months as I train i can get some time in at higher elevations, but they would probably be no more than 2000 feet.

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