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ExpertKipWatcher
RE: Women runs 520 miles on treadmill in 7 days but doesn't get WR as Guinness says her witness doesn't count

Incredible wrote:
I lost 12 pounds on a long run once.
Was that water, fat, muscle,..?
Think about it geniuses.

If true (which I doubt) it would have been water, glycogen and a small amount of fat. Thing is once you ate and drank you would quickly return to your pre-run weight.

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