I've been long distance running for one+ year and have a marathon under my belt (in addition to dragon boating for three years) and being a college student, my meals usually consist of cheap things like cereal (Cheerios), sandwich + apple, and soup/pasta and exercises are general leg stretches (and now leg strengthening due to recovering ITBS injury). I currently have a well paying job so money restrictions in terms of food aren't necessarily an issue as much any more. I'm hoping to step up my game and achieve a core fitness level of having a six pack of abs and since long distance running is kind of the opposite of general strength building (muscles effectively being dead weight and/or 'burned away' in long distance running hence the huge body type difference between LDRs and sprinters, although one can argue having strong abs to help the back is a good idea), I'm wondering the plausibility of this goal.
Is it possible to be a long distance runner and have a six pack (not necessarily be ripped everywhere, just have a strong core to help out the back and the like) and what meal plans and training/stretches/exercises are ideal towards achieving a strong six pack core while being able to maintain decent long distance running (eg not cut carbs from meals)?
(The more specific the better I think)