Re: Physical Training?
Crossfit, P90X, and running. You will go far... For the Marine Corps, it would behoove you to run three miles in 18 minutes, do 20 pullups, and get 100 crunches in two minutes, as Lindy said. The best way to get better at crunches, is to do crunches. The best way to get better at pullups, is pullups. The best way to get better at running is..... yeah, running. Crossfit and P90x are excellent supplements to a daily workout, even if it's a light workout, as well as good nutrition.
Oh... and for Army... do pushups too.
Good luck.