I've never hit the wall before, but I've met enough marathon runners to know its lore. McDowell shared a few things marathon runners can do before and during the race to hop over that wall. "When you're training for a marathon, you want to be training your eating and drinking as well as your running," McDowell said. Most marathon runners do this with supplements, which come in various forms, from gels to chews. She said most marathon runners — especially first-timers — walk at least part of the race.

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