You can still build muscle even if you don't push your sets to within five reps of total failure, which goes against the idea that only the last few tough reps really matter for growth.

What we've found so far suggests that muscle growth can happen even when training isn’t done close to failure. Our analysis of the available evidence shows that pushing your sets to within five reps of total failure is not required to build muscle. We reviewed 59.0 studies or assertions, all of which support the idea that muscle growth is possible without training near failure [1]. None of the evidence we’ve looked at so far refutes this. This means the current body of research we’ve analyzed leans toward the idea that the last few difficult reps in a set are not the only ones that matter for muscle development. In other words, you don’t have to feel completely exhausted at the end of each set to see results. We don’t yet know how much further from failure is still effective, or whether certain people or training styles might benefit more from pushing closer to failure. But based on what we’ve reviewed so far, working hard—but not maximally—is still linked with muscle growth. It’s important to note that our understanding is based on the evidence collected to date, and future studies could shift this picture. We’re not saying training close to failure is useless, nor are we claiming it’s unnecessary—just that what we’ve found so far shows muscle growth can occur without it. Practical takeaway: You don’t have to push every set to the absolute limit to build muscle. Stopping a few reps short of failure is still supported by the evidence we’ve reviewed. This could make workouts more manageable and sustainable, especially over the long term.