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It was going to be a revolution. For the year between the 1979 and 1980 Mr. Olympias, as high-intensity training rode the crest of its foremost adherent, Mike Mentzer, it seemed on the verge of transforming bodybuilding. Mentzer adopted the HIT philosophy of Arthur Jones and expanded it into his own radical system, named Heavy Duty. Reps got lower, weights got larger. In this article, we examine the rapid rise, faster fall, and enduring impact of Heavy Duty.
He advocated a heavier form of HIT. Whereas Jones prescribed one 20-rep set per exercise, Mentzer lowered the ideal rep range to six to nine: Choose a weight so heavy that you reach absolute failure at six to nine reps, then keep going. Failure wasn’t enough for Mentzer’s Heavy Duty system. It went beyond. The three techniques Heavy Duty prescribed most were forced reps, negative reps, and rest-pause. Mentzer trained with at least one partner (frequently his younger brother, Ray, 1979 Mr. America winner), who spotted him and assisted when he reached failure. The partner removed just enough stress for two or three forced reps. He helped raise the weight so it could be lowered as slowly as possible. Or he spotted while Mr. Heavy Duty paused between reps, grinding out a few “singles” in a manner known as rest-pause.
“If you’re skeptical [of Heavy Duty’s low volume], your subconscious child is telling you that more is better. In some cases that’s true. More money is better than less. But you can’t take that principle and blindly apply it to exercise and expect to get anything out of it.” — Mike Mentzer
As a 27-year-old IFBB Pro League rookie in 1979 noted especially for his delt, arm, and leg density, Mentzer was a phenomenon. Capping off the year by winning the heavyweight division of the
Mr. Olympia (but not the overall), he emerged as bodybuilding's heir apparent. He released two popular Heavy Duty booklets in 1980, and through his articles, seminars, and mail-order business his philosophy was as great a sensation as he was on stages. It seemed every bodybuilder tried his lower-rep HIT, though most eventually returned to a higher-volume system.
Then came the 1980 Mr. Olympia. The greatest representative of the old guard, Arnold Schwarzenegger, won. The insurgent 28-year-old Mentzer finished a controversial fifth and, in the aftermath, retired. He seldom even trained again. Mike Mentzer died in 2001 at 49. His Heavy Duty formed the cornerstone of six-time Mr. Olympia Dorian Yates' regimen, and it continues to influence bodybuilders today.
HEAVY DUTY BASICS
HEAVY DUTY TIP SHEET