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Mix up your workouts and diet, do as posted above and focus more on body weight exercises. Instead of only doing longer runs do some shorter speed workouts, ie run as fast as you can for as long as...

Run til you get tired then tell your brain to shut up and keep running, I recently did a half marathon even though the longest I had ever ran was a 10k. Needless to say I haven't stopped running...

Why only some core work? You're core is involved in every type of movement and exercise, having a weak core will only make things harder in the long run. Also mix in a run outside once in a while....

6 Pullups
82 Crunches
12:02 1.5mile run