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It just takes practice. But only some people can perform it well, for example Arnold, Park, and Ray. Prolly due to a full rigcage. So thats prolly where you think it's genetic. But everyone can do it for sure.
If you've got the Arnold enclyclepedia which im sure you have (as everyone does) check out the abs section, Arnold tells you how to perform it and progress it from kneeling on the floor to standing.
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