An isolation exercise. Synergistic muscles: Obliques and Iliopsoas (hip flexors). Learn why the reverse crunch is more effective than the standard crunch on my site.
6 exercise circuit to work ALL of your ab muscles. Crunch and reverse crunch for the top layer, oblique crunches and Russian twists for the middle layers and plank and single leg stretch for the deepest core muscles
Even women who are otherwise slender and fit can end up with a belly pooch due to underworked lower abdominal muscles. This weekend, do 3 sets of 10 Reverse Crunches before breakfast, lunch, and dinner.