The Two Days Before The Marathon...
You cant sleep
You should expect nerves to disrupt your sleep on the night before the marathon, so aim for a long nights sleep two nights before it instead. On the night before the race, eat early, and relax by watching a video with friends to take your mind off the big day.
You buy new shoes or clothing
Resist the temptation to race in them! Youll find some bargains at the Marathon Exhibition when you register, but dont try them out on race day. You risk chafing and blisters at best. Make sure youve done at least a few long run in the shoes and clothes you will race in.
You have family obligations
Dont cut off your nearest and dearest, but do try to let them know you should stay off your feet as much as possible in the 48 hours before the race. Sadly that means no eight-hour tour around the citys great sights on Saturday.
You feel sluggish on an easy run
Not a problem this is an odd training week for everyone, but your body will click into action on race day. Do use your last runs to throw in some light, easy strides to stretch your legs, and stretch well afterwards.
You arent thirsty enough to drink
Force yourself you wont be able to make up for it in the morning before the race. Sip often. And avoid caffeine and alcohol, which contribute to dehydration.
You dont know what to eat
Simple: stick to tried-and-tested foods, avoiding seafood and spicy food. Aim for slightly more carbohydrate and slightly less fat than usual on the day before the race, but its better to eat constantly through the day than fill yourself to the point of discomfort before going to bed.