The basic variation in the effect of an ab exercise comes from whether you contract your abs though a full range of motion, or only a partial range and how much resistance you subject these muscles to. So the upper and lower abs pretty much work as a single until.
The principle of non-contiguous innervation tells us that motor neurons do not stimulate specific muscle fibers in limited locations or groups but innervate muscles over widespread areas.
The fibers of External and Internal Obliques run diagonally on the body, allowing for angled movement.Īlthough you can feel more or less stress in different areas of the abs doing different movements, there are no different exercises for upper and lower abs. It wraps laterally around the abdominal area. The Transverse Abdominis (also known as the Transversus) is the deepest muscle of the core (meaning it’s underneath all the other muscles). Thin bands of connective tissue give it that appearance. The Rectus Abdominis muscle is commonly known as the “six-pack” muscle of the abs. The abdominal muscles sit on the front and sides of the lower half of the torso, originating along the rib cage and attaching along the pelvis. The major abdominal muscles are as follows: The abdominals attach between the pelvis and the rib cage, and their function, in addition to being stabilizers, is to pull these two body parts together in a “crunching” movement – where the torso rolls or curls forward as if into a ball. We and our partners store and/or access information on your device, such as unique IDs in cookies to process personal data. They do not contract over a range of motion, which is what is needed in a primary ab exercise. The role of the abs in these exercises is simply to act as stabilizers. The legs stay in place and it’s the torso that lifts up, also making use of the hip flexor muscles. 
The sit-up is just the mirror image of the leg raise. They run from the lower back across the top of the pelvis and attach to the front of the thigh. The muscles that raise the legs are the iliopsoas or hip flexor muscles. Stand up and hold onto something for balance. They believe these are the best exercise for abs. Go into almost any gym and you’ll see people doing exercises like sit-ups and leg raises.
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