What actually is the core? Has anyone seen a scientific definition? To my know knowledge there is no definition of the core in research literature. I first came across the term the term in 1987 when I first read the book Total Body Training (Dominguez, Richard H. M.D., and Gajda, Robert S.. New York, N.Y: Warner Books,1982.)The term made sense to me so I started using it. They offered no re
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