Overload in practise

Marathon is a long race programme.You will have to prepare for the long race perfectly. Your blind and Overload in practise can cause problems like Fatigue,Hyponatremia,Poor diet, Dehydration and Lack of sleep. Mental fatigue often was as much a problem as physical fatigue.All these effects your training.Additional variable also effect the person and race i.e. weather,cold,heat,rain and wind.
To go from weakness to strenth----remember several tips:-
Best coach guides to learn how to accept the discomfertness due to race.
Drink a large glass of water an hour before going on a race.
Start and end with a large glass of water.
To manage the problems use only water while practising.
Water does replace the sodium lose in sweat and increase urine production.