In the ever-evolving landscape of fitness science and muscle hypertrophy, few publications generate as much anticipation as those involving prominent researchers in the field of exercise physiology. A newly released study—authored by a powerhouse team including renowned hypertrophy expert Brad Schoenfeld and social media-active researcher Milo Wolf, alongside T. Hermann, A.E. Mohan, A. Nes, M. Sappupo, A. Piñero, A. Zamanzadeh, M. Roberts, M. Coleman, P. Androulakis Korakakis, M. Refalo, and P.A. Swinton (2024)—has once again pushed the boundaries of how we understand muscle growth.
The study, titled "Without fail: Muscular adaptations in single set resistance training performed to failure or with repetitions-in-reserve," investigates the nuances of training intensity, shedding light on critical variables such as volume, frequency, and proximity to failure. Far from being just another academic paper, this research provides actionable insights that can fundamentally reshape how both everyday gym-goers and elite athletes structure their resistance training routines.
Main Facts: What the Study Discovered
At its core, the study set out to analyze the effects of varying training intensities on muscle mass gains across two distinct groups of participants. While the primary variable separating the groups was training intensity—specifically, whether exercises were performed to absolute muscular failure or stopped just short of it—the broader implications of the findings ripple across other foundational training metrics, including overall training volume and frequency.
The primary takeaway from the investigation is remarkably democratic: both groups achieved virtually identical gains in muscle mass. Although the participants who pushed every single set to absolute muscular failure experienced a marginally higher rate of growth, the difference was not statistically significant.
For decades, the fitness industry has operated under the dogmatic assumption that if you do not leave a puddle of sweat and collapse in exhaustion after every set, you are leaving gains on the table. This study directly challenges that premise. It demonstrates that stopping a set slightly short of failure—specifically, leaving a couple of repetitions in reserve (RIR)—can yield comparable hypertrophic results to grinding out repetitions until movement failure occurs, at least under specific conditions.
Chronology and Context: The Evolution of Hypertrophy Research
To fully appreciate the weight of this new study, it is necessary to examine the chronological progression of fitness science over the last two decades.
The Era of "No Pain, No Gain" (Early 2000s and Prior)
For generations, bodybuilding lore dictated that maximum muscle growth required maximum effort on every single set. Legendary bodybuilders and early fitness influencers popularized the notion that true growth only begins after you reach the point where you can no longer complete a repetition with proper form. Science, at the time, struggled to keep up with anecdotal practices.
The Shift Toward Evidence-Based Fitness (2010s)
As exercise science matured, researchers like Dr. Brad Schoenfeld began putting traditional gym dogma under the microscope. Meta-analyses and randomized controlled trials started isolating variables like volume, frequency, and intensity. Researchers began asking: Does training to failure actually accelerate muscle growth, or does it merely introduce excessive fatigue?
The Modern Frontier (2020s to Present)
Today, researchers are looking at the fine print. Studies are no longer just asking "Does lifting weights build muscle?" but rather "How do proximity to failure, volume accumulation, and recovery interact?" The inclusion of digital-native scientists like Milo Wolf reflects a modern shift in science communication, where complex academic literature is rapidly translated, debated, and dissected across digital platforms. The 2024 paper by Hermann et al. represents the pinnacle of this current era: a granular look at the trade-offs of localized fatigue.
Supporting Data and Experimental Design
Understanding why the participants in the study achieved similar muscle growth despite differing intensities requires a closer look at the experimental design and the underlying physiological mechanics.
The Single-Set Protocol
Crucially, the study was designed using a single set per exercise per session. This methodological choice is the master key to unlocking the interpretation of the results.
When an individual performs only one hard set of an exercise, the systemic and localized fatigue accumulated is relatively low. Under these conditions, whether you push that single set to absolute failure or stop two repetitions short (2 RIR), the total stimulus delivered to the muscle fibers is nearly identical, while the recovery cost remains manageable.
The Problem with Systematic Failure
However, the authors and sports scientists analyzing the study emphasize that the difference between training to failure and leaving repetitions in reserve becomes vastly more pronounced as volume increases.
If you incorporate multiple sets per exercise and multiple exercises per muscle group throughout a weekly routine, training every single set to absolute failure introduces a massive recovery debt. The central nervous system (CNS) becomes battered, joint wear-and-tear accelerates, and localized muscle damage skyrockets.
Consequently, a negative correlation begins to emerge:
- High Intensity + High Volume = Burnout and Suboptimal Recovery. If you insist on training to absolute failure on every set, you must severely restrict your overall training volume.
- Moderate Intensity (RIR) + Higher Volume = Sustainable Growth. By utilizing repetitions-in-reserve, you reduce the per-set fatigue cost, allowing you to perform more total volume and train with a higher overall frequency without crashing your recovery capacity.
Official Responses and Expert Reactions
The release of the Hermann et al. (2024) study has sparked intense debate within the evidence-based fitness community.
Dr. Brad Schoenfeld, a co-author of the study and a globally recognized authority on muscle hypertrophy, has consistently advocated for a balanced approach to resistance training. Speaking on the broader implications of proximity-to-failure research, Schoenfeld has noted that while training to failure can be a viable tool, treating it as a mandatory requirement for every workout is counterproductive for the vast majority of trainees.
Milo Wolf, another prominent co-author whose engaging digital presence bridges the gap between laboratory data and gym floors, has emphasized the practical application of the findings. Wolf points out that many gym-goers drastically miscalculate their actual proximity to failure, often claiming they are "training to failure" when they actually have four or five repetitions left in the tank. Conversely, those who genuinely do hit true failure on every set often find their progress stalling due to chronic fatigue.
Independent exercise scientists and coaches reviewing the paper have largely praised its rigorous control of variables, noting that it reinforces the concept of autoregulation—the ability to adjust training intensity and volume based on daily readiness and recovery status.
Practical Implications: How to Apply the Science to Your Training
Translating academic literature into tangible gym results is where the true value of studies like this lies. Based on the findings of Hermann et al. (2024) and the broader consensus of modern hypertrophy science, here is how you should structure your workouts:
1. Embrace Repetitions in Reserve (RIR)
You do not need to turn every set into a psychological battle against failure. For most of your working sets, stopping 1 to 3 repetitions short of failure (1–3 RIR) will deliver nearly identical muscle-building stimuli while sparing your joints and central nervous system. Reserve absolute failure (0 RIR) sparingly—perhaps on the final set of an isolation exercise, or not at all.
2. Balance Intensity and Volume
If your program features a high training volume (many sets per muscle group per week), you must dial back your intensity. Trying to perform 15 to 20 hard sets per muscle group per week all taken to absolute failure is a direct ticket to overtraining, tendonitis, and diminished returns. Conversely, if you prefer low-volume training (e.g., High-Intensity Training or HIT protocols with very few sets), pushing those few sets closer to failure becomes much more viable.
3. Prioritize Training Frequency and Recovery
The study’s secondary insights underscore the relationship between volume, frequency, and recovery. To maximize muscle growth, frequency matters—you want to stimulate muscles multiple times per week rather than completely obliterating them in a single session and spending seven days recovering. To train a muscle frequently, you cannot constantly push every set to the absolute limit. Managing your proximity to failure allows you to recover faster, train more often, and accumulate higher quality volume over the course of a macrocycle.
Bibliography
- Hermann, T., Mohan, A.E., Enes, A., Sappupo, M., Piñero, A., Zamanzadeh, A., Roberts, M., Coleman, M., Androulakis Korakakis, P., Wolf, M., Refalo, M., Swinton, P.A., Schoenfeld, B.J. (2024). Without fail: Muscular adaptations in single set resistance training performed to failure or with repetitions-in-reserve. DOI: 10.51224/SRXIV.484
Leave a Reply