tyson did some weights work as part of his training regime but never took anabolics- the testing by the boxing authorities is too rigourous and frequent for Tyson to ahve done any cycles
his physique and low body fat is a result of boxing training
Holyfield may have used steroids to bulk up from cruiiserweight to heavyweight- he did train with lee haney, and during holyfields bulkup over 1 year he somehow lost his hair

the story goes Tyson came up to cormier- who was bouncing @ the nite club, slapped him hard on the back of the neck, and said "hes a big boy, he can take it".
cormier wouldve been knocked out cold b4 he could get his hands up to try to protect himself