External Oblique definition
Part of the torso, the external oblique is on the body’s ribs where they join up with the cartilages. The lateral edge of the rectus abdominis is attached to the medial edge through the use of a tendon that covers the latter muscle. The external oblique allows the ribcage to rotate from side to side. The left external oblique pushes the ribcage causing the left shoulder to move to the front; this works the same way for the right external oblique. It is also responsible for bending the lower part of the spine side to side.