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Learn how to use cluster sets to maximize your training intensity and overall work volume.
The set is the basis of everything you do in the gym. It comprises a certain number of reps, after which you rest briefly before moving on to your next set. But, just as there’s more than one way to skin a cat, there are several ways to structure your sets. If your goal is to lift as heavy as possible and turn up the intensity, then you need to know about cluster sets.
Cluster sets are an advanced training technique, but there is some confusion surrounding them. Some people confuse them with rest-pause training, while others mix them up with drop sets. In this article, we’ll clear up the confusion as we explain exactly what cluster sets are, why they’re a good technique for increasing strength and muscle, and how you can program them into your routine.
In this article, crafted by the knowledgeable Steve Theunissen, a seasoned personal trainer and author with an array of certifications from the International Sports Sciences Association, and refined by Tom Miller, CSCS, known for his reputable fitness insights across major publications, we’ll demystify cluster sets. We’ll delve into their benefits for strength and muscle gain and how to effectively incorporate them into your training regimen.
What are Cluster Sets?
Cluster sets are like a series of mini-sets within a larger set. You do a certain number of reps, then rest for a few seconds before doing the next cluster of reps. Typically, a cluster set will consist of three or four of these mini-sets. Cluster sets are considered an inter-set form of training.
Cluster set training is popular among powerlifters and other strength athletes. There is a large body of research investigating its benefits to enhance strength and power. That research tells us that different forms of cluster training are more beneficial for different outcomes.
There are three primary reasons that you would include cluster set training in your routine:
- Strength
- Power
- Hypertrophy
When it comes to power training, the goal is to develop explosiveness. You should use a reduced weight that is 40 to 65% of your one-rep max. The focus will be on completing three to five clean, explosive reps. You then rest for around 20 seconds before completing the same number of reps again. You will usually complete three of these many sets while focusing on maintaining excellent form and producing as much explosive power as possible.
Power training cluster sets aim to train for power rather than exhausting your muscle fibers. This type of training has also been shown to improve the neurological pathways between your muscles and brain.
Cluster sets for strength training should see you working with between 80 and 90% of your one-rep max. So you might take a weight that you can perform four reps on and do two reps. You then rest for around 30 seconds and then do two more. If you did this for a total of four mini-sets of two reps each, you would end up doing eight reps within that cluster set. That represents double the volume and a substantially increased amount of intensity compared to if you were to just do a traditional set of four reps.
When it comes to hypertrophy, cluster sets are an excellent intensity-enhancing tool. That is because it allows you to train with heavier weights than you could usually do to complete the set. It also increases your time under tension. But unlike traditional sets, where it’s usually only the last two or three reps that could be described as high threshold time under tension, with cluster sets, every rep is a high threshold time under tension rep.
Finally, cluster sets allow you to achieve muscle overload. For example, you might choose a weight with which you could normally do eight reps and perform a cluster set of six, four, and three-rep mini sets. That’s a total of 13 reps — five more than you previously would have done.
Cluster Set Research
The vast majority of the research into cluster sets focuses on strength and power training. This research highlights five key benefits of cluster set training.
Rep Quality
According to some research, cluster set training improves the technical precision of each rep within the cluster set. That makes sense because, unlike with straight-set training, there is no fatigue accumulation to impair performance on the last few reps. Doing a technically demanding exercise like the clean and jerk or snatch using the standard high rep approach can lead to form breakdown. However, when you’re only doing a couple of reps and then having a short rest, you are far more likely to maintain correct form. [1]
Greater Power Output
Research suggests cluster sets can result in greater power output on each rep than straight-set training. Again that’s because there is less accumulated fatigue going into each new rep. Greater power output means more explosiveness in sports like basketball, football, and powerlifting. [2]
Reduced Inter-Set Fatigue
Cluster set training, when done in power training and strength training style, will reduce the cumulative fatigue effect from set to set and exercise to exercise. This is beneficial when you want to move to a new exercise fresh and relatively unaffected from the previous exercise. That is what you want when you are training for power and strength. With hypertrophy training, of course, your goal is the opposite — you want to increasingly fatigue the muscle as the workout progresses. [3]
Power Endurance
A 2008 study showed that cluster set training could help develop power endurance very effectively. This type of muscular endurance is needed by cyclists, soccer players, and people who play racquet sports. [4]
Increased Strength and Power
Cluster sets have been shown to produce superior results than traditional straight sets in terms of power and strength gains. In a 2013 study, 22 men were assigned to either a cluster set or a traditional set training protocol. Each group followed a 12-week training program. At the end of the study, the cluster set group showed significantly greater improvement in the bench press, vertical jump, and squat. However, the two groups had no significant difference in lean mass gains. [5]