A set can feel productive without ending in a failed repetition. For muscle growth, the useful question is whether that final all-out effort consistently adds something worth pursuing. Research does not establish that every set must reach momentary failure to support hypertrophy.

What the research found

A systematic review and meta-analysis found no clear hypertrophy advantage for reaching momentary muscular failure compared with stopping short. Definitions of failure and proximity to failure differed across studies, making the exact dose-response relationship uncertain. [1]

This does not mean effort is irrelevant or that very easy sets are equivalent to demanding training. The evidence challenges the need to take every set to an absolute limit, not the need for a training stimulus.

Make effort intentional

Decide how demanding a set should be before starting, and record the work you complete. Avoid treating failure as the only sign of a worthwhile session. A plan can include challenging sets without turning each one into a test of your absolute limit.

Putting it into perspective

Suppose the final repetition becomes a failed attempt every session even when the programme did not require it. The effort is visible, but it may not answer a useful planning question. The review gives room to evaluate challenging work without making an absolute limit the only acceptable ending to a set.