Double Leg Raise, Scissors This challenging but simple move is so effective — and it specifically works the pesky lower ab area that can be difficult to target at times. You'll also take advantage of a nice quad exercise, which can help with running. Lie on your back with arms at your side. Pull yout navel into the spine. Lift both legs up at once until they are perpendicular to the floor. Slowly lower back down. Do not let your back arch up off the floor. Add a scissor kick vertically and horizontally up to a few inches (legs stay straight and move up and down or side to side and crisscross each other). Image Source: POPSUGAR Studios