The Science of 'More Is Better'
For decades, the default advice in gyms has been to simply do more. More sets, more reps, more days. This is based on a well-established principle: training volume is a primary driver of muscle growth (hypertrophy). Training volume is essentially the total
amount of work you do, often calculated as sets multiplied by reps multiplied by weight. Research, including a major 2024 meta-regression, confirms that as weekly training volume increases, so do gains in both muscle size and strength. This dose-response relationship is why someone doing ten sets per muscle group per week will generally see more growth than someone doing only three. It's the scientific validation behind the hard work ethic of the gym. However, the story doesn't end there. The relationship isn't linear, meaning you don't get the same reward for every additional set you perform.
Understanding Diminishing Returns
The principle of diminishing returns is a fundamental concept that applies to fitness just as it does to economics. In the beginning of your training journey, your body is highly responsive, and progress comes quickly. Those initial sets provide a powerful stimulus. But as you become more trained, each additional set you add provides a progressively smaller benefit. The first five weekly sets for your chest might yield significant growth. The next five will still add muscle, but not as much as the first five. The five after that? Even less. Eventually, you reach a point where adding more volume provides negligible returns while dramatically increasing fatigue, recovery demands, and the risk of injury. This is the point of diminishing returns, where the investment of time and energy is no longer worth the tiny reward. Think of it as junk volume—it adds to your workload without contributing meaningfully to your goals.
What the Latest Research Says
Recent findings, including new 2026 guidelines from the American College of Sports Medicine (ACSM), have helped crystallize where this point of diminishing returns might lie. The general consensus for hypertrophy is that 10-20 hard sets per muscle group per week is the evidence-based sweet spot for most lifters. A notable 2026 study published in the Journal of Applied Physiology provided a stark illustration of this. Researchers took experienced lifters and divided them into groups. One group maintained their current training volume, while others increased it by 30% or 60%. Counterintuitively, the group that did not increase their volume made the best strength gains, while muscle growth was similar across all groups. This suggests that once you are adapted to a certain workload, simply piling on more sets is not the answer and can even be counterproductive for strength. The ACSM's latest update reinforces that roughly 10+ weekly sets per muscle group is a key target for growth, moving the focus away from complex protocols and toward accumulating sufficient quality volume.
Finding Your Volume Sweet Spot
The optimal volume isn't one-size-fits-all; it depends on your training experience, which muscles you're working, and your recovery capacity. Beginners can see significant growth with as little as 10-12 weekly sets per muscle group, as their bodies are highly responsive to new stimuli. Intermediates may need to push into the 12-18 set range to continue progressing. Advanced lifters, who are closer to their genetic potential, might require 16-22+ sets to eke out further gains. It's also muscle-specific. Some muscles, like the side delts, can handle and may even require higher volumes (20+ sets), while others like hamstrings might see peak results with fewer sets, around 14 per week. The key is to track your weekly volume per muscle group and only increase it when your progress stalls, rather than assuming that more is always the answer from the start.
Train Smarter, Not Just Harder
The big takeaway from the latest research is that consistency and quality trump sheer volume. Rather than cramming 20 sets for chest into a single marathon session, you're better off splitting that volume across two workouts. Research suggests there's a cap on productive volume in a single session, often estimated around 8-10 hard sets per muscle. Beyond that, you're likely accumulating more fatigue than stimulus. Focus on making your sets count by training with high intensity, typically leaving only 1-3 reps in reserve. A few hard, focused sets provide a much better muscle-building signal than a dozen sloppy, half-hearted ones. The goal is to find the minimum effective dose that still drives progress, allowing you to recover properly and stay consistent over the long term.
