Probably the most popular of the abdominal group!
When you think of your 'abs' - do we not all think of Rectus Abdominus first - aka "the six pack"
(and sometimes eight pack!)
left image of abs c/o myweightlifting.com
Muscle Attachment Points
Origin: pubic crest and the pubic symphysis
(where your tummy/stomach ends and your pelvis starts!)
Insertion: ribs 5-7 and the sternum* (aka breastbone)
*more specifically, the lil' bone at the bottom of the sternum :
the xyphoid process - you know, that bump feels uncomfortable to press on? don't do it!
Muscle Action (s)
Flexion of the trunk at the spinal joints
an example of this is a good ol' fashioned sit up!
Rectus Abdominus is also what helps to make up our "core" - strong
abs = good posture = happy spine = happy life !
Try it now!
a) sit tall - gently squeezing your tummy tight back in towards your spine (aka - activating your abdominals) - notice how your pelvis rotates, you're sitting taller, causing a beautiful chain reaction of good posture right up into your chest shoulders..?)
b) now totally let go - relaxing all stomach muscles -
can you feel the difference a strong core makes?
'washboard abs' image c/o exercisemenu.com
There are few more abdominal muscles to cover so remember the next time you hear 'abdominals' - it's so much more than just the '6 pack abs' - stayyy tuned!
And speaking of six pack abs.....
there are a frightening amount of '6pack o' beer' stomach tattoos out there...thanks internet!