I believe that it is after washing it
Do you have a like text book for this for me to answer?
The armpit isn't the most precise but it is close. Under the tongue, across the forehead, as long as you have the proper tools (thermometer, the thermometer meant for foreheads) you should get a fairly accurate reading.
A dinner comprised of rice and chicken. Rice is a simple carbohydrate and will build up the ATP in his system to make his run time better and give him energy. Chicken is a long term energy source that will keep him full and his muscles working throughout the marathon.