The claim

“You have to train to failure to build muscle.”

False

Evidence confidence Moderate

The short answer

You do not have to train to failure to build muscle; sets stopped short of failure build muscle about as well.

What this means for you

You can build muscle without pushing every set until you cannot do another rep. Hard sets that end close to failure work about as well, as long as they are truly challenging.

Your next step

In your next workout, end most sets when you feel you could do only a couple more good reps.

The evidence

Why this confidence?

Meta-analyses of training trials find that sets stopped short of failure build muscle about as well as sets taken to failure, so failure is not required. Sets that end closer to failure build somewhat more muscle, but that is about effort, not a need to reach failure; confidence is moderate because the studies were small, mostly in young adults, and defined failure in different ways.

The facts

You do not have to train to failure to build muscle; sets stopped short of failure build muscle about as well. Effort still matters, though, because sets that end far from failure tend to build less.

The bigger picture

A 2022 meta-analysis of 15 studies, all in young adults, found no overall difference in muscle growth between training to failure and stopping short, though failure showed a small advantage in people who already lifted. A 2023 meta-analysis of 15 studies found a trivial advantage for failure when any definition of failure was used, and no advantage when failure meant truly being unable to do another rep. A 2024 analysis that estimated how many reps people left in reserve found that muscle growth increased as sets ended closer to failure, while strength gains were similar across a wide range; the authors called the analysis exploratory because the rep counts were estimates. How close to failure sets need to end, and why that depends on the weight you lift, is covered in our card "Training close to failure is the key to building muscle."

Does training closer to failure build more muscle?

Up to a point, yes. Muscle growth tends to rise as sets end closer to failure, but going all the way to failure adds little or nothing beyond stopping just short.

Sources (3)

Last reviewed 2026-10-21 We update these cards as new research comes out. When the evidence changes, our verdicts change too.

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“You have to train to failure to build muscle.”

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