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I've heard that marathon runners have around 3%, and that if you drop below that you run a serious danger of health problems. I've heard that many elite athletes go from 5-10%. Anything less than 3-4% and I'm real tempted to call BS.
And by the looks of it, Sean Sherk and BJ Penn are worlds apart man!
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My BJJ lineage.......Mitsuo "Count Koma" Maeda > Carlos Gracie Sr. > Helio Gracie > Rolls Gracie > Romero "Jacare" Cavalcanti > Allen Mohler > Kirk Gibson > me (white belt).
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