The core consists of muscles in your lower back, pelvis and abdomen, all of which work together. To better understand core conditioning, you have to know what the muscles are that you’re targeting.
Here are the four most common ones:
Rectus abdominis: This muscle provides the “six-pack” look.
External obliques: These muscles run down the side and front of your abdomen. You target these with exercises like the Russian twist.
Internal obliques: These lie beneath your external obliques and run in the opposite directions as them.
Transverse abdominis: This is the deepest abdominal muscle, and protects your spine.
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