It is important to practice what you will take in nutritionally on a regular basis so there are no surprises on race day. Practicing trains and teaches your body to process and absorb calories while you are at effort. Any problems you may be experiencing with the nutritional side of things can be worked out in your training sessions so there are no surprises on race day. The final reason nutrition is important on your long runs is because the run itself will be easier to complete and recover from if you are consuming calories with regularity throughout.
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