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1) There is a gap between the ribcage and the hip, which allows for bending and twisting.
2) Between this gap the waist becomes very thin.
3) If a horizontal line is drawn at the thinnest point of the waist, the navel falls beneath it.
4) More specifically, the navel rests at the center of the rectus abdominis muscle, at the top of the lowest, somewhat longer "ab."
Happy navel spotting!
