This core exercise is a good workout for the whole abdomen. It engages all the abdomen muscles. It strengthens the rectus abdominis, internal obliques, and the external obliques.
How To Do
1. Lie down with your legs bent at the knees.
2. Elevate your upper body so that it creates a V shape with your thighs.
3. Twist your torso to the right, then reverse the motion, twisting it to the left.