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The concept of Iron Body has more to do with packing ki onto the physical vessel then it has to do with being indistructable. Without going into a long disertation on the Taoist methodology of Iron Body it is accomplished in Aikido through ki breathing exercises, misogi and taking ukemi (tonifies the internal organs).
As for rooting, "keep weight underside" as I read somewhere before, don't walk with your weight forward (like most people) but walk with your weight projected down in your feet while maintaining your center.
Peace.
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