too much
I often have peanut butter and jelly as the peanut butter will give you protein and if you use a wholesome jelly it can give you the benefits of a fruit. Then I usually drink something like Gatorade or powerade with it, that is filled with electrolytes, but water is a good choice too. you don't want to fill up to much as this will cause cramping (as you probably know already). If you are talking about the meal the day before your marathon, something full of protein such as meats is a good choice and be sure to keep yourself hydrated all leading up to your marathon.
55-year-old marathon runner.
Because there was probably previous Marathons before the London Marathon. Example - a runner in a Marathon could have the number 1498 when there is only 357 people running there with him/her. The next Marathon might have less people but even higher numbers.
You should read the maze runner instead of divergent.
I am 6'1" and weigh 170 with a BMI of 22
It depends on how much running experience you have already and how much time you have to train.
Well if it were me I would train my legs as much as I can in fact I would train the day I heard about the marathon.
6
This is a good website to start with: http://www.guardian.co.uk/lifeandstyle/2012/apr/18/how-much-water-drink-marathon The typical answer seems to be about 1.2 litres/hr
That depends on your definition of fit and the athletes at question. For example, if the 400m runner is Jeremy Warner and the half marathoner is an overweight man that only trains 3 days a week, the 400m runner would be much fitter. In general a half marathoner will be much fitter than a 400m runner in aerobic fitness but slightly weaker in anaerobic fitness. So it depends what your definition of fit is. I am a long distance runner, so my opinion is biased, but I believe that a half marathoner is fitter than a 400m runner for many reasons. Usually long distance runners are much leaner due to the excessive amount of long distance runs they do on a weekly basis. Half marathoners also do a fair amount of speed work and weights, which ensures that their neuromuscular fitness is sufficient to allow them to take advantage of their aerobic fitness. Because of this the half marathoner would be much closer to a 400m runner in a 400 than the 400m runner would be to the half marathoner in a half marathon. When I say closer, I mean percentage wise because it would be unfair to compare them by time difference due to the distance discrepancy between the two events. The half marathon would allow for a much bigger time difference than the 400 due to the distance discrepancy. I hope this information helps you decide which athlete is the most fit!
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They should drink as much as their body tells them to. Your body has thirst sensors and they will tell the runner if they need to drink and how much.