Latest Author Articles from Broady Calebhttp://www.articleside.comen http://www.articleside.com/fitness-articles/fitness-guide-is-essential-in-developing-six-packs.htm the core muscles are the group of 6 muscles that extend from the ribs to pelvis. the most superficial muscles are the rectus abdominals. working out this muscle will give the 6 pack abs effect. the de...