Heavy Duty Workouts for Bodybuilding

Written by the Boostcamp staff
Sep 4,2023 | 9 min read 400

Is the Heavy Duty training method worth it?

When it comes to bodybuilding training and bulking up, we tend to think that higher reps with medium weights are the way to go, but is that true? Or could heavier, intense, low rep workouts be more beneficial for bodybuilding than massive amounts of volume. We tend to think that low reps are for powerlifting and strength sports, but workouts of this nature may be just as good for bodybuilding, this is the Heavy Duty workout method. 

Let’s dive in.

The Heavy Duty Workout

Let’s take a look at the Heavy Duty Training method, otherwise known as high intensity training, or HIT. No, not high intensity interval training, that is HIIT, and refers to short, sporadic workouts that come in intervals, with minimal rest in between each set or circuit, and HIIT workouts often refer to cardio. 

On the other hand, what we are talking about is heavy duty training. This is a method used by some of the biggest bodybuilders of all time. Two of the names that come to mind when heavy duty workouts are mentioned are Mike Mentzer and Dorian Yates, both being world class bodybuilders. Mentzer was a Golden Era bodybuilder that brought amounts of muscle mass to the stage that had never been seen before. Dorian Yates took that a step further, bringing even more muscle mass, and then he won the Mr. Olympia 6 times. Both of these competitors used the heavy duty, high intensity, low rep training method, so what exactly does that entail?

Mike Mentzer

Mike Mentzer (image courtesy of Instagram (mentzerhit)

The heavy duty workout method is much more than just low repetitions. It involves really brutalizing the muscles, breaking them down like never before, but doing low volume as a whole. Heavy duty training involved doing about 1-3 warm up sets, followed by only 2 working sets. The working sets consisted of only 6-8 reps per set, so that’s nothing, right? Wrong.

Heavy duty training meant that the last rep of each of the working sets was just about absolute failure. From there, the lifter would push beyond the point of failure and utilize training methods such as forced reps, partials, and negative reps, all of which will require a training partner. 

Forced Reps

The training partner will assist the lifter in completing more reps after they hit absolute failure. Tom Platz is someone who preaches forced reps, stating that when you are absolutely done, you actually have five more reps in the tank.


This is where the lifter will only complete part of the repetition, so form is pretty much compromised, but not to the point where you are blatantly risking injury, and tension is kept on the targeted muscle. 

Negative Reps

For negative reps, the training partner will help the lifter complete the positive half of the rep, then the lifter will hold the weight and lower it slowly, usually for a set amount of time. This keeps a lot of tension on the muscle. 

The bottom line when it comes to heavy duty training is you have to push the weights to absolute failure. Even though heavy duty training consists of low reps, those reps involve a good mind-muscle connection, and pushing that last rep to failure, but it does not stop there. Heavy duty training pushes you to always go beyond failure with things like partial reps, forced reps, and negatives.

Heavy Duty Recovery

Now, with heavy duty training, there has to be recovery equivalent to the intensity of the workouts. High intensity workouts will break down the muscle like never before, really leaving you needing to focus on recovery like never before. Recovery is where you truly grow, and the muscle fibers repair and grow bigger and stronger. So, what do you need to do to get your recovery in check?

Rest Days

Heavy duty workouts absolutely cannot be completed every single day. The intensity of these workouts is something that needs to be spread out in between training sessions. For example, while the heavy duty training program calls for training each body part twice a week, Mike Mentzer trained only three days a week, with four days dedicated to rest and recovery. He split his body into two parts, and his workouts into Workout A, and Workout B. 

Dorian Yates on the other hand worked out each muscle group once per week, with 2-3 rest days a week. 

The point is, rest days are essential to give your body a few days without taking a beating. This does not mean taking weeks off of the gym at a time, as frequency still matters, but if you are truly utilizing the heavy duty training program to the fullest extent, then you should be taking a few rest days per week. 


Sleep is where the body generates the most testosterone and human growth hormone, which are both essential for building muscle and staying healthy. That being said, prioritize maintaining a proper sleep schedule as part of your recovery protocol.

Diet and Supplements 

Another one of the most important parts of recovery is diet. Eating the proper foods to refuel your muscles is crucial to get them to repair and grow, especially after heavy duty training. 

Piggybacking off of your diet, supplements are just as important because they help to make sure you are getting the proper amount of macro and micronutrients that you may not get just from your diet. Things like protein powder, creatine, and multivitamins are great supplements to help with your recovery. 

Finding a Workout Program

If the heavy duty training method does not interest you, there are plenty of workout programs to choose from on the Boostcamp App. There are actually over 50 free workout programs designed for strength and hypertrophy training, and you can even create your own programs. 

Heavy Duty Workout Wrap Up

Overall, the heavy duty training program is something that is not for the faint hearted. Heavy duty workouts involve low reps, but they are some of the most intense and demanding reps that you will put yourself through. Aside from that, you really need to prioritize recovery.

Do you think you have what it takes to do some heavy duty training?

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Header image courtesy of Instagram (@mentzerhit)