Tight/Sore Abs After Running, Any suggestions?

I have been running (doing the couch to 5k program) for about 6 weeks, I just switched over to a different running program that requires longer runs but continues to incorporate much needed short walking breaks. Today after my run I felt like I had done 500 sit ups (my abs were so tight it was hard to breath and sitting on the couch is uncomfortable). I realize this probably means I need to work on my core. What exercises do you recommend (number, frequency). Any help you can suggest I greatly appreciate, I am in agony and don't want to keep feeling this way after a run (BTW I felt wonderful while I was running it was after I started to feel very uncomfortable). Also any stretches to help with this before and after a run. Thank you for your help!!

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