So what is the primary functions of the recus abdominis?
To answer this we need deturmine the primary function of the “core”. The core prevents movement, not creates movement. The core is there to protect the spine and not create more movement around the spine.
Just look at the logic at some of the exercises out there. The rotational chop (using lumbar rotation) or Russian twists, these movements attempt to take the lumbar spine beyond it’s range of motion which is in fact only 13 degrees 5 degrees of which comes from L5-S1. Take a look at the video below to see the movement I am talking about.
So with that thought in mind if we take a look at the primary function of the rectus abdominis then we can see from logic that flexion is not but rather “anti-flexion”.
So the 2 primary functions of the rectus abdominis are:
1. Eccentric deceleration of the trunk into extension.
2 Isometric stabilization on the lumbar spine and pelvis.
In “Alternative to Situps – Part 3” I am going to post a video with instructions of some alternative exercises you can perform along with progressions.