Get Flatter Abs -- Advanced Level
Stability Ball Reverse-Hyperextension2Lie face down with your torso and hips resting on the ball, and place your hands on the floor in front of you for balance. Raise your legs so that they're even with your body. Keeping your toes turned out, squeeze your glutes and lower back to extend your straight legs up to the ceiling. Lower to the straight position, and repeat.
Quick change: Squeeze your glutes and hold for a few seconds at the top of the move for an added burn.
Kneel in front of the ball and place your hands on top of it, shoulder-width apart, arms straight. Roll the ball out in front of you, keeping your core tight. The ball can roll under your forearms at this point. Roll the ball back to start.
From push up position, place your shins on a stability ball so that you straddle the ball knees-to-ankles. With abs held tight, slowly roll your knees to the left, then use your obliques to roll your knees back to the start. Repeat to the other side.