My wife is doing her first marathon the week before St. George, 9/29 at Lake Tahoe. She just did 18 this morning, will do about 10 next week, 20 on 9/8 and then taper off for the final 2 weeks. She felt great today, and I'm sure will do fine at 26.2.
As for nutrition, for longer runs it seems like I recall that you should be replenishing carbs at a rate of about 60% per hour of what you are burning them. So if you are burning roughly 800 kcals/hr, plan on taking in 400-500 cals every hour. Thats a ton, btw. Shot blocks go down very easily, much easier than any bar I've eaten. Cut them in half and they will practically melt in you mouth (not in your hand). Gu is not bad either, but some people with texture issues struggle with it.
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