My daughter, trains for and runs marathons and half-marathons.
If you are interested, i could contact her (she's in LA, Ca & i'm in CT) and see if she would have the time to correspond with you via email and pass on tips she's learned from "professional" marathoners she's trained with.
Let me know.
Oh,...BTW, great Avatar, you've got there. Looks sorta' like my mother-in-law. [just kidding, she's a great lady - would have to be to put with me for over 27yrs]