Abdominal Muscle Basics

At this point, every household in America probably knows that the abdominal muscles are collectively referred to as the abs. Keep in mind that your abs aren’t just in front of your body but wrap around your body. This fact is important in training because many people only seem to be concerned with training what they see — the front and center — but your abs cover much more of your body.
You have four abdominal muscles:

• Rectus abdominis: This is the largest abdominal muscle and runs from your breastbone to your pubic bone, a few inches below your belly button. The rectus abdominis

1. Curls your spine forward when performing crunches (or when you double over with laughter from watching Desperate Housewives).
2. Keeps your spine still when you move other parts of your body, such as when you lift a heavy box off the floor.

• Obliques, internal and external: These muscles run diagonally up and down your sides. Your obliques

1. Help your rectus abdominis curl your spine forward.
2. Enable you to twist and bend to the side.
3. Provide lower back support.

• Transversus abdominis: The transversus abdominis sits directly beneath the rectus abdominis and is the deepest of all your abdominal muscles. This muscle

1. Is continuously working when you’re sitting and standing.
2. Helps support your lower back and keep good posture.