Get rid of the Donut!

So I've been working out at the Gym every week day. Running about 3 miles each day on the treadmill and weight lifting and doing some ab work every day. But that stubborn part of your stomach just doesn't want to seem to go away anytime soon. Bikini weather is approach and I want to make that donut or muffin top go away or flatten! ANYBODY HAVE IDEAS OR WORKOUTS ON HOW TO GET RID OF IT???? Once I've succeed getting rid of it, I'll deff. feel much comfortable about myself & know there's less jiggliness going on down there!!!