The first time I tracked every set for a full month, my notebook filled up fast. By week three I could see a pattern: the days I pushed harder, I did fewer sets. The days I backed off, I squeezed in more. Neither felt wrong. Both felt like progress.
So which actually builds more muscle? Let’s look at what the evidence says.
The Why
For years now, research has leaned toward higher training volumes for muscle growth. Meta-analyses — including the most recent one by Pelland et al — consistently show that more weekly sets per muscle group generally produced more hypertrophy.
This relationship holds across different rest periods, study durations, proximity to failure, and even training experience. It’s remarkably robust.
But the returns are diminishing. Doing up to 30-40 weekly fractional sets appears optimal for hypertrophy, though the best bang-for-buck may come in a bit lower.
The How
On the other side of the debate, high-intensity lifters swear by one all-out set taken to failure. The argument: if you go truly hard, you don’t need much volume.
There is evidence here too. A major meta-analysis by Robinson et al showed that the closer a set is taken to failure, all else being equal, the more muscle growth you see.
A study by Hermann et al found single-set training caused hypertrophy — but going to failure beat training with two reps in reserve. And Larsen et al observed greater hypertrophy when lifters trained past failure rather than stopping at full range of motion.
The Takeaway
Both approaches work. Combining them likely leads to the best results.
Most people can recover from more training than they think. A study by Brigatto et al had lifters perform nearly 200 total weekly sets without it being detrimental to hypertrophy. The infamous Enes quadriceps study put lifters through an average of 42 quad sets per week for 12 weeks, close to failure — and they still grew more.
Recovery is rarely the bottleneck in practice. It’s about maximizing stimulus.
Your Move:
- If you have time: aim for higher volume at a lower intensity. Keep sets submaximal using the RIR (Reps in Reserve) scale — it saves energy and builds consistency.
- If you’re short on time: do 4-10 hard sets per muscle per week, taken truly near failure. Quality over quantity works here.
- If recovery is solid: combine both. Track your lifts; if they hold or rise, keep pushing.
My notebook says: start where you are, push a little further than feels comfortable, and let the numbers tell you when to stop.