Core Wars
A truth thats told with bad intent beats all the lies you can invent!
William Blake
the action or process of directing someone to the wrong place or in the wrong direction.
Attention should be drawn to the fact that the core is ​​​​not ​just these four muscles making up the abdominal section.
Rectus abdominis. Transverse abdominis. Internal obliques. External obliques.

No one would have believed, in the last years of the twentieth century. That humanity would be so quick to believe that a few crunch like exercises would, for all intent and purposes solve that one unanswerable question, the very question that has not only eluded but befuddled bemused and flumoxed, the greatest minds of the 17th, 18th and 19th does one reduce the ever expanding waistline?? It would appear that some mediocre minds of the twentieth century followed Houdini's favourite word (Misdirection) and confused a lot of people , because over the last 10 or so years there has been an absolute  tsunami of 'core' classes. you may know some. Ab Attack, Total Abs, Hiit abs (total core apparently) Non stop abs, Total core (all abs} Bosu core, Sports specific core (with plank), Fitball core (sit ups), Strictly core, the list goes on. 
Sadly, for the gym goer too much abs can actually end with an injury.    
The core group that we should be concentrating on are somewhat bigger than four (4) muscles and they are listed below;
Origin‎: Transverse process
Insertion‎: ‎Transverse process above‎
Action‎: ‎Lateral flexion of trunk
Rectus abdominis
Origin: Pubic crest and the pubic symphysis
Insertion: From the fifth to seventh costal cartilages, and the inferomedial costal margin and posterior aspect of the xiphoid process of the sternum
Actions: Flexion of the vertebral column, posteriorly tilts the pelvis,
Origin‎: Spinous process
Insertion‎: ‎Spinous process
Action‎: ‎Extension of vertebral column‎
Transverse abdominis
Origin: Deep lower costal cartilages 
iliac crest
Insertion Xiphoid process, lines alba, symphysis pubis.
Action: maintenance of abdominal tone
Origin‎: ‎Transverse process
Insertion‎: ‎‎Transverse process‎ and ‎lamina,  Spinous process
Action: Rotation of the vertebral column
Internal obliques
Origin: Lumbar fascia, anterior two thirds of the iliac crest, lateral two thirds of the inguinal ligament.
Insertion: Lower borders of the lower three ribs and their costal cartilages. Xiphoid process. Linea alba. Symphysis pubis.
Action: Lateral flexion of the trunk against resistance.
Maintenance of abdominal tone

Origin‎: Sacrum‎, Erector spinae PSIS‎, and ‎Iliac crest 
Insertion‎: ‎Spinous process aponeurosis
Action: extend vertebral coloumn
External obliques
Origin‎: ‎Ribs 5-12‎
Insertion‎: Iliac crest, Pubis tubercle Linea alba. 
Action: pulls the chest downwards and compress the abdominal cavity
Pelvic floor muscles
Origin: Ramus and tuberosity of ischium 
Insertion: Ensheaths internal structure the genitals
Action: Compresses deep structures in the genital organs and forces blood into its body.

Erector spinae (sacrospinalis) 
Origin: Lumbar fascia, anterior two-thirds of the iliac crest, and the lateral two-thirds of the inguinal ligament
Insertion: Costal margin, aponeurosis of the rectus sheath, conjoined tendon to the pubic crest and pectineal line, 10-12 rib
Action: Compresses abdomen; unilateral contraction rotates vertebral column to same side
Origin: Sternum and xiphoid process anteriorly
Insertion: Central aponeurotic tendon
Action: Inspiration
When you hear core, think of the whole of the trunk and glutes. Yes when you do abs you are strengthening the muscles and as we already know, muscle is metabolically active and it does help to reduce body composition, just not directly at the area you are working.