The rectus abdominis muscle does the following:
Flexes the spine.This means that the rectus abdominis muscle bends the spine to the front (i.e. it moves the sternum down and forward towards the pelvis).
Compresses the abdominal cavity.
Rectus Abdominis - A long vertical muscle that runs the length of your torso, starting just above your pubic bone and ending in your lower ribs. It provides stability to your torso.
Rectus abdominis - The muscle extending the entire length of the abdomen, from the lower 3 ribs to the top of the pubic bone (below the navel). Works to keep you upright and lets you bend at the waist.
Rectus abdominis: Controls the tilt of the pelvis and curvature of the lower spine.
Rectus Abdominis - The straight muscles of the abdominal. "Rectus" means straight or upright, as in "erect".
Rectus Abdominis - located along the front of the abdomen, this is the most well-known abdominal muscle and is often referred to as the "six-pack" due to it's appearance in fit and thin individuals.
Rectus Abdominis
Obliques
Comments
The Obliques and the Transversus Abdominis increase the intra-abdominal pressure necessary for the support of the vertebral column in some exercises.
Rectus abdominis - Compresses abdomen and flexes vertebral column
External obliques - Bends vertebral column laterally and rotates vertebral column
Transversus abdominis - Compresses abdomen
Quadratus lumborum - Side flexion ...
Rectus Abdominis and Obliques
By strengthening the abdominals we can increase intra-abdominal pressure and support the spine from the front. Keeping these postural muscles strong is important.
The rectus abdominis (upper and lower abs) is responsible for the standard crunching motion - moving your ribcage toward your pelvis. It also gets trained in the opposite direction, bringing your pelvis to your ribcage, as in the reverse crunch.
-The Rectus Abdominis
(composed of upper and lower abdominals)
-The Oblique Muscles
-The Intercostal Muscles
-The Serratus Anterior ...
Others say that rectus abdominis (the six-pack look is the result of bands of connective tissue that "cut" into rectus abdominis) is just one muscle, and doing separate exercises for the upper and lower abs is a waste of time.
So, who's right?
TARGET MUSCLES: RECTUS ABDOMINIS
RESISTA-BALL TRUNK FLEX-
Lie on RESISTA-BALL with back slightly extended shoulders higher than hips and buttocks pressed firmly against the RESISTA-BALL. Knees are bent to 90°, slightly outside shoulder width.
Muscles worked:
Rectus Abdominis, front part of the abdominal wall, with more emphasis on the lower portion of the muscle.
All three are located to the right and to the left side of your rectus abdominis (ab muscles). They are covered by less fat, so it is easier to make them visible. As they become stronger, they will flatten your stomach much more than before.
Lying beneath the obliques is the rectus abdominis, which helps to flex (bend) the spine. Its fibers run vertically from the top of the pubic bone to the lower ribs.
In the hanging leg lift, the rectus abdominis must rotate the pelvis posteriorly and stabilize the pelvis to allow the legs to move freely toward the chest.
What you need to do is a series of exercises that work all the muscles in the abs (the rectus abdominis and obliques) from different angles. There are three so-called "Places of motion". When you bend forward, you work the sagittal plane.
Your abdominals, which include the rectus abdominis, internal and external obliques and transverse abdominis are crucial for a variety of trunk movements like flexion, rotation and compression.
This exercise works the entire rectus abdominis, but because you have to balance yourself on the ball it focuses on developing the small stabilizer muscles.
Midsection Muscles of abdominal area, including upper and lower abdominals, obliques and rectus abdominis muscles.
Military Press Pressing a barbell from upper chest upwards in a standing or sitting position.
Crunches work your abs, but for the biggest benefits, you need to work your entire core, which is made up of the four layers of the abs (rectus abdominis, external and internal obliques, and transverse abdominis), hip flexors, spine extensors, ...
The lower back muscles consist of the erector spinae, rectus abdominis, transverse abdominis and deep intrinsic muscles, all of which provide both voluntary movements and stability.
 See also: Exercise, Lower, Back, Obliques, Strength
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