 Most bodybuilding and weightlifting authorities do not take into account the severe nature of the stress imposed by heavy, strenuous resistance exercise carried to the point of positive muscular failure.Mentzer's training courses (books and audio tapes), sold through bodybuilding magazines, were extremely popular, beginning after Mentzer won the 1978 IFBB Mr. Universe contest.This contest gathered a lot of attention, because at it he became the first bodybuilder ever to receive a perfect 300 score from the judges.