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A member asked:
How do marathoners run so long? most don't have much fat reserve?
A doctor has provided 1 answer
Training,nutrition: You train your bodies systems over many months, slowly. At the same time you learn the proper nutrition to fuel your body properly, not only while running, but pre- and post - run. Also, you ingest energy sources and fluids and electrolytes while running.
Answered 1/18/2013
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