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Oh no, I'm only going to try once, but thanks for the encouragement! Any advice from a doctor?

You should definitely see your doctor first for the heart examination.Hydration and nutrition are very important for the success of your training runs and race. You should drink water or a sports drink while running, especially when going over 90 minutes. Do not wait to feel thirsty to drink something; at that point, your body is already dehydrated.

Cool, thanks! That's great advice, I usually never drink during a run, so good to know.