Healing your "mummy tummy" Diastasis Recti: Separation between your abdominal muscles will constantly cause the "pooch" and crunches actually worsen the gap. There are exercises here that will help to strengthen your core and make that gap smaller.
Well now that I've done a marathon here's my thoughts: At mile more was all that was going through my head. At mile the finish line seemed so close yet so far away. At mile I could hardly believe it. At mile there was NO better feeling :)