A human body contains approximately 206 bones. Skeleton provide a framework that supports the soft tissues so the body can maintain its form and erect posture. Some bones serve as protectors for certain vital organs. Others work together to act as a system of levers the muscles can use to move the body or external objects. Bones can produce certain blood cells and also serve as storage centers for several essential minerals. Bones may be divided or classified into two basic groups known as the axial skeleton and the appendicular skeleton.

The axial skeleton consists of 80 bones that make up the head, neck, and trunk. It houses the spine, which is the main support column for the body. Therefore, the axial skeleton's position and role during any resisted movement is always of particular concern and primary importance.

The appendicular skeleton consists of 126 bones that form the shoulders, pelvis, arms, legs, hands and feet. Most of the movement we can perform and use for resistance training are a result of moving the bones of the appendicular skeleton.

While appendicular skeleton moves against the resistance, the axial skeleton supports and stabilizes the body.

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