Try this at-home ab-burner and see for yourself.
1 Minute, Ab Crunch (Keep Legs at 90 Degrees)
Rest 15 seconds.
1 Minute, Bicycle Crunches
Rest 15 seconds.
1 Minute, Leg Raises
Rest 15 seconds.
1 Minute, Plank
Rest 15 seconds.
Repeat this circuit 3 times.