Few topics in the modern fitness community divide practitioners quite like the eternal debate between training volume and training intensity. On one end of the spectrum, you find the higher-volume camp—the proponents of the "more sets equals more growth" philosophy. In recent years, this school of thought has frequently advocated for keeping working sets slightly submaximal, often utilizing the Repetitions in Reserve (RIR) scale to gauge fatigue and manage recovery. On the other end, high-intensity lifters swear by a minimalist "one all-out set to failure" approach. The foundational argument for this side often rests on the premise that higher volumes cannot be adequately recovered from, and that piling on extra sets yields diminishing or even zero actual benefits for muscle hypertrophy.
Yet, as the fitness industry becomes increasingly saturated with conflicting anecdotal advice, researchers continue to put these competing methodologies to the test. So, what does the scientific literature actually say is best for maximizing muscle hypertrophy?
For years now, the prevailing scientific consensus has leaned toward higher training volumes holding the upper hand for muscle growth. Comprehensive meta-analyses—including the most recent one led by Pelland and colleagues—consistently demonstrate that a greater number of weekly sets per muscle group generally produces superior hypertrophic outcomes. When zooming into the results of the Pelland et al. meta-analysis, this relationship proves remarkably robust. The trend holds true across a variety of experimental conditions, including different rest periods, varying study durations, different degrees of proximity to failure, and even across subjects with differing levels of prior training experience.
However, the benefit is far from completely linear. The returns on investment in training volume are subject to the law of diminishing returns. While current data suggests that performing up to 30 to 40 weekly fractional sets may sit at the outer edge of what is optimal for sheer hypertrophy, the best "bang for your buck" in terms of time and recovery is typically obtained at a somewhat lower threshold.
This highlights the primary drawback of a high-volume approach, which is practical rather than theoretical. Pushing toward the maximum limits of recoverable volume is time-consuming, profoundly fatiguing, and often difficult to sustain alongside the other demands of daily life. Furthermore, most controlled scientific studies tend to isolate one or two specific muscle groups. This means that what is locally "recoverable" within the sterile confines of a laboratory study might not necessarily be globally sustainable when applied to a comprehensive, full-body training program over the course of several months.
Meanwhile, the alternative philosophy favoring low volume paired with extreme intensity has gained massive traction, particularly across online fitness spaces and social media platforms. The core claim underpinning this movement is straightforward: if you push a set to genuine, unadulterated failure, you simply do not need a high volume of sets to trigger maximal growth.
There is indeed a body of empirical evidence designed to support this perspective. Most notably, a major recent meta-analysis conducted by Robinson and colleagues showed that the closer a set is taken to momentary muscular failure, all else being equal, the greater the resulting muscle growth.
Likewise, other recent investigations suggest that there is a distinct physiological benefit to training right up to, or even past, failure. For instance, a study by Hermann and colleagues demonstrated that single-set training did successfully cause significant hypertrophy, but that taking those sets directly to failure was superior to leaving two repetitions in the tank. In a similar vein, a study by Larsen and colleagues compared ending a set at full range-of-motion failure against performing partial repetitions past failure, observing even greater hypertrophy in the group that trained past the point of initial failure. Clearly, taking sets to failure—and potentially pushing beyond it—provides an additional stimulus that submaximal training may lack.
This naturally brings practitioners back to the central question: which approach is truly better?
If you are hoping for a definitive, black-and-white answer, the scientific reality will likely leave you disappointed. The fundamental truth of the matter is that it entirely depends on how one defines the word "better." In empirical science, researchers must isolate a single variable to draw meaningful conclusions. For example, a typical study might compare higher volume versus lower volume while keeping rep ranges, proximity to failure, and exercise selection identical.
As a direct consequence of how research is conducted, the real-world debate pitting "high volume submaximally" against "low volume to failure" is largely speculative. In practice, it is fairly clear that both methods can work remarkably well, and it is also highly likely that intelligently combining aspects of both approaches will lead to the absolute best long-term muscle growth.
In truth, most individuals are capable of recovering from far more physical stress than they initially realize. Resistance training can be pushed surprisingly far—encompassing both high volume and high intensity—before recovery limitations truly begin to cap further progress.
To illustrate this point, a study by Brigatto and colleagues had trained lifters perform nearly 200 total weekly sets without observing any detrimental effects on muscle hypertrophy. Similarly, the widely discussed Enes quadriceps training study required participants in the high-volume group to complete an average of 42 sets of quad-focused training per week for a duration of 12 weeks. Even operating close to failure, these subjects still experienced superior muscle growth compared to lower-volume groups. In fact, nearly all of the contemporary studies examining extreme volumes of 20 or more sets per muscle group per week have featured subjects training to failure on every single working set.
Ultimately, when it comes to muscle growth, more work is certainly more—provided the body can adapt. Recovery is rarely the primary bottleneck to making physical gains in practice. Rather, the real challenge lies in effectively maximizing the training stimulus while balancing the realities of life outside the gym. While high volume and high intensity each present unique challenges, understanding how they interact allows lifters to tailor their programming to their individual goals and lifestyles.
