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==The Challenges==
There are several difficulties in running marathons on consecutive days.
* [[Glycogen ]] Depletion. [[Glycogen ]] is the stored in the muscles as a fuel for running, and the lack of glycogen is a primary limiting factor in marathon running.
* [[Delayed Onset Muscle Soreness]]. While the pain of DOMS is normally noticed 24-48 hours after exercise, the weakness is immediate.
* Muscular Soreness. This refers to non-DOMS muscle soreness and generally responds to different treatments. With DOMS the muscles are tender to the touch and often have pronounced weakness. With non-DOMS soreness, massage can feel painful but good.