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Of The Four Body Types, A Body Type Four has 10 to 0 out of 33 spinal vertebrae fully extended and muscle mass mostly undeveloped throughout the body as a whole.

Of The Four Body Types, A Body Type Three has 21 to 11 out of 33 spinal vertebrae fully extended and muscle mass partially developed throughout the body as a whole.

Of The Four Body Types, A Body Type Two has 32 to 22 out of 33 spinal vertebrae fully extended and most muscle mass developed throughout the body as a whole.

Of The Four Body Types, A Body Type One has all 33 spinal vertebrae fully extended and most if not all muscle fully developed throughout the body as a whole.

Do you know how and what is your body type? The Four Body Types scientific research: take the science-based Body Type Shape Quiz/Test (male/man & female/woman)