Core Training, also known as abdominal training involves the use of your Abdominals, Obliques and/or Erector muscles. The core actually consists of many different muscles that stabilize the spine and pelvis and run the entire length of the torso. These muscles stabilize the spine, pelvis and shoulder and provide a solid foundation for movement in the extremities. Core conditioning exercise programs need to target all these muscle groups to be effective. The muscles of the core make it possible to stand upright and move on two feet. These muscles help control movements, transfer energy, shift body weight and move in any direction. A strong core distributes the stresses of weight-bearing and protects the back.
Benefits of Core Training:

Helps to prevent injuries. A strong, stable core can help to prevent injuries because with stronger muscles supporting the spine, pelvis, and shoulder joints it can better handle the forces of rotation and compression that lead to back and joint injuries.
Helps to improve bowel function and reduces incontinence. Once again the pelvic floor muscles are part of the core. These muscles help to eliminate waste products from our bodies through contractions. If these muscles are weak or deconditioned they cannot contract properly which may lead to incontinence or improper bowel functioning.
Reduces risk for low-back pain and injury. Core exercises are designed to stretch and strengthen the muscles, tendons, and ligaments that support and protect the spine.

Improves posture making the stomach look flatter.