I've been having a problem with the front of my lower legs, the pump in the front gets too painful when I run too fast. It drives me nuts, I try and run to get them warmed up and that seems to help and then stretch them and walking for a bit.
I think its anterior compartment syndrome. Not sure what to do about it.
I trained for a marathon a few years back, got up to twenty miles on my sunday long runs, never ran it. Its a goal I make every year to do it once in my life to run that damn marathon, maybe this is the year, I said that last year though lol