Bone density has been proven to increase to small degree but Roy Jones has the head the size of a walnut, to exaggerate a bit. He was only competitive in the heavyweight division against Ruiz because of his freakish handspeed and reflexes. Ruiz caught him with decent punches (never flush or serious) and hurt him several times. If Ruiz hit him with the hook Tarver did, it very well could have killed him.
Look at Bob Sapp. He weighs 350 lbs of lean muscle, owns a neck and pair of traps that probably makes Tyson and Holyfield feel self conscious but he can't even safely absorb an arm punch delivered by a K-1 level striker. No amount of muscle mass can help a weak chin. No amount of muscle mass can make a former middleweight take a heavyweights punch if he couldn't take that punch weighing 160 lbs (as Toney was capable of doing at that weight).
Look at Bob Sapp. He weighs 350 lbs of lean muscle, owns a neck and pair of traps that probably makes Tyson and Holyfield feel self conscious but he can't even safely absorb an arm punch delivered by a K-1 level striker. No amount of muscle mass can help a weak chin. No amount of muscle mass can make a former middleweight take a heavyweights punch if he couldn't take that punch weighing 160 lbs (as Toney was capable of doing at that weight).
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