| http://www.w3.org/ns/prov#value | - When that happens, the runner's pace can drop about 30 percent, and ketones, the byproducts of fat metabolism, start building up in the body, causing pain and fatigue.People think hitting the wall is inevitable, but it is not, says Rapoport, who has run 18 marathons, including a personal best of 2:55 at this year's Boston Marathon.
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