In the last post we discussed the external obliques and how they run in the shape of a "V" down the outsides of our mid-section. Now it's time to discuss the...
Internal Oblique Muscles
Just as their name suggests, these muscles run internal or just below the external obliques. The external and internal oblique muscles are at right angles to each other—meaning, the external muscles form a 'V' and the internal muscles form an inverted 'V'.
These muscles attach at the lower three ribs and your inguinal ligament (the cool line down the middle of your abs) and angle back to the iliac crest then to the lower back. Like the external oblique muscles, the internal obliques rotate the torso, provide sideways bending and compression of the abdomen.
So picture this...
Because of how the external and internal obliques line up... when your torso rotates left, the external obliques contract on the right side. When your torso moves to the right, the external obliques on the left contract. Visualize this next time you're doing Mason Twist.
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