Yea, me being just under 6'1 it's def doable, but I feel like it's barely doable. 6'7 like halfwit would be a daunting task but like said, anything is possible and the right person could certainly do it. BUT on the arnold height, there are many reports that arnold was frauding his height and is more like 5'10... I wouldn't doubt it, that dude has always done anything in the realm of deception to elevate himself, wouldn't be surprised if he wore lifts every day of his life just to keep that up.