Rectus abdominis
Abs, six-pack · Core
- Origin
- Pubic crest and pubic symphysis
- Insertion
- Xiphoid process and costal cartilages of ribs 5 to 7
- Action
- Flexes the trunk and braces the abdomen
The 'six-pack' muscle running down the front of the abdomen. Crunches flex it directly; planks use it to resist the spine sagging, and leg raises use it to curl the pelvis up.