The Structure of the Core Muscles

The core muscles are at the centre of the body and wrap around the internal organs and attach on the ribs, spine and hips. The main muscles involved include: the transversus abdominus, rectus abdominus , external oblique, internal oblique. These four primary ab muscles join to totally cover the internal mid-section of the body (FIG II)


Transversus abdominus – the most profound muscle layer. Its principle parts are to settle the storage compartment and keep up interior stomach weight.

A. Rectus abdominus – threw between the ribs and the pubic bone at the front of the pelvis. This muscle has the trademark knocks or lumps, when getting, that are regularly called ‘the six pack’. The primary capacity of the rectus abdominus is to move the body between the ribcage and the pelvis.

C. External Obliques are the outside slanted muscles– these are on each side of the rectus abdominus. The diagonal muscles permit the torso to twist.

Internal obliques – are located just inside the hipbones. They operate in the opposite way to the external oblique muscles. For example, twisting the trunk to the left requires the left side internal oblique and the right side external oblique to contract together.

These muscles cooperate to deliver most extreme strength in though the mid-section and lumbar (lower) back district, and direction the development of the arms, legs, and spine. Connecting with these muscles is not something that the vast majority do deliberately, hence it is essential to figure out how to adequately co-contract these muscles while performing an abdominal workout.

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