Now, after your run, do your ab training. Do 4 exercises focusing 1 exercise on your upper abs, one for your lower abs and one for you core. For each exercise, do 3 sets and about 30 reps each set. For starters do crunches, reverse crunches, bicycle crunches and plank. For your plank exercise, do about 1 minute and really squeeze your abs.
There you go, this my dirty secret to how get abs without gym when I was college where sometimes I do not have access to go to gym and have to prepare for a contest or modeling show. Please ask advice from your doctor before trying it if you have any medical issues.
Do not try to use this technique for long term, for about 1 month is ok. It will hit plateau because you still need weight training to increase your metabolism. In order to make your weight loss long term and get maximum results. You need to get yourself a weight loss system that works for you.