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@deleted
A small muscle? I don't think you're talking about the same thing, my friend.
First of all the abdominal muscles are made up of 4 separate muscle sheets converging into a single aponeurosis.
Rectus abdominis is the one that gives the 6 pack.
Then you have External, Internal Obliques, and finally Transversus abdominis.
On your back, you've got your Erector Epinae set, Quadratus Lumborum and Psoas Major.
These muscles, are anything but small- trust me I've cut them open.
Their aponeurosies are incredible strong and powerful, forming a vast amount of very important structures, not least the inguinal canal- through which- on a weakened muscle- you set yourself up for herniations.
As functional muscles, they could not be more important. Antagonistically they work to allow you to do anything you so wish to do. A poor support structure is a classic way of unevenly loading your back, during other exercise, causing a multitude of possible injuries.
Your core muscles- are called that because without them, you can't do shit.
And the fact that there are 4 separate on the front is why you do different exercises, to work all of them evenly, then work the back to even it out.