First, What Is Training Volume?
Before diving into the science, let's define our terms. 'Training volume' is simply a way to measure the total amount of work you do in a workout. The most common way to calculate it is by multiplying your sets by your reps. For example, if you do 3 sets of 10
reps on the bench press, your volume for that exercise is 30 reps. When people talk about 'weekly volume', they’re usually referring to the total number of hard sets performed for a specific muscle group, like your chest or back, over the course of a week.
Understanding 'Diminishing Returns'
The law of diminishing returns is a concept that applies to everything from economics to your evening chai—the first cup is amazing, the second is good, but by the fifth, you’re just jittery. In strength training, it means that while adding more sets initially leads to significant gains, each additional set provides progressively less benefit. The first few sets stimulate muscle growth effectively. After a certain point, however, adding more volume gives you very little extra muscle for a lot of extra effort and fatigue. The key question has always been: where exactly is that point?
What the Latest Research Says
Recent meta-analyses, which combine the results of multiple studies, have sharpened our understanding of this dose-response relationship. A landmark study from early 2025, followed by a detailed meta-regression, has given us some of the clearest numbers yet. The research confirms that more volume is generally better, but with a major catch: the returns diminish quickly. For muscle growth (hypertrophy), gains increase with weekly sets, but the benefit of each added set gets smaller and smaller. Most studies suggest the 'sweet spot' for the majority of lifters lies between 10 to 20 hard sets per muscle group per week. Below 10 sets, you might be leaving gains on the table, but pushing far beyond 20 sets often leads to a point where the tiny potential benefit is outweighed by the massive increase in fatigue and time commitment.
Strength vs. Muscle Growth
Interestingly, the latest research also shows a crucial difference between training for size and training for pure strength. The point of diminishing returns for strength gains arrives much sooner than it does for muscle growth. One major analysis found that benefits for strength tapered off significantly after just two direct sets per session. This doesn't mean you should only do two sets, but it suggests that for getting stronger, frequency—hitting a muscle group more often with lower volume per session—is a more effective strategy than one massive, high-volume workout. For muscle size, you can push the per-session volume a bit higher before the returns drop off.
How to Apply This to Your Workout
This research empowers you to train smarter, not just harder. First, start tracking your weekly sets per muscle group. It's the one thing most gym-goers don't do. Are you doing 8 sets for your back, or 28? Knowing this is the first step. For most people, aiming for 10-20 weekly sets per muscle is a highly effective range. If you’re a beginner, starting closer to 10 sets is perfect. If you've been training for years and have stalled, gradually increasing towards 20 sets might be what you need. Instead of doing all 16 sets for your chest in one marathon Monday session, split it into two workouts of 8 sets each. This manages fatigue and improves the quality of each set, leading to better results over time. Finally, listen to your body. Recovery is where growth happens. If you’re constantly sore and fatigued, you might be doing too much volume, no matter what the studies say.
