+1. But, what kind of running is the trick...
If you run on a flat incline, you're just burning calories. To burn fat, you have to run on an incline... I was up to 6 miles a day 10lbs ago. An expert stepped in and held the up-incline button until I was at 10% and clinging to the side rails.
Got me past that plateau.
But, 50% of abs is diet.
Plug ScottHermanFitness, 6 pack abs into Youtube.
It'll be another 20lbs before I see mine. But, my ass is firm, finally.
Trainers I work with hate the ab crunch machines at the gym.
Better exercises happen on the floor with the addition of cable crunches and hanging leg lifts.
But, you have to focus on contracting with your stomach, not your front quads or other muscles or you're doing it wrong.