Is One Set Actually Enough to Build Muscle? This Study Has a Surprising Answer

May 14, 2026

If your schedule feels packed, long workouts day in and day out can be hard to keep up with. You may have heard that for a workout in the gym to be effective, you have to do several sets of each workout. A recent study shows that effective strength training may not need as much time as many people think.

A 2025 study explored whether a single set per exercise could still drive meaningful progress in trained lifters. The findings add to a growing body of evidence that consistency, effort, and smart programming often matter more than marathon gym sessions.

What Did the Study Look At?

The study explored whether a low-volume training approach could still produce meaningful results in trained lifters.

Instead of multiple working sets, participants performed one hard set per exercise using two different strategies:

To failure, where participants continued until they could not complete another repetition with good form
With repetitions in reserve (RIR), where they stopped a few reps before reaching that point

Researchers then measured muscular adaptations after the training period, including:

Muscle thickness
Strength
Muscular endurance
Lower-body power and performance

That matters because the participants were already resistance-trained. Progress often comes more slowly once you have training experience, so seeing improvements in this group can be especially relevant for regular gym-goers.

What Did Researchers Find?

Both groups made meaningful progress across multiple measures, even with just one set per exercise.

That suggests a focused, lower-volume program can still be effective when training effort is high and exercises are well-selected, even in experienced lifters.

The group training to failure appeared to have a modest advantage in some areas, particularly certain measures related to:

Muscle growth
Explosive lower-body performance

However, differences were smaller for:

Strength
Muscular endurance

In practical terms, this means there may be more than one productive way to train.

Going all the way to failure may offer extra benefits in some cases, but stopping close to failure can still support progress while feeling more manageable for recovery and consistency.

Why This Matters for Everyday Lifters

Many people delay strength training because they believe they need:

An hour a day
A perfect split routine
Endless exercises
High weekly volume

In reality, a well-structured plan you can repeat consistently is often the better option.

If a 20-minute workout fits your life and keeps you engaged, that will be more valuable than a complex program you abandon after two weeks or consistently skip out on day to day.

What Is “Training to Failure” Really?

Training to failure sounds intense, but it simply means reaching the point where another clean rep is not possible.

That does not mean every set needs to become a dramatic all-out effort. In practice, many people can make progress by finishing sets close to failure while maintaining good technique.

A useful target is to end a set feeling like you had 1 to 3 solid reps left. This can help balance challenge, recovery, and long-term adherence.

The Bigger Lesson

This study does not mean more volume never works. It means less can still work well, especially when effort and consistency are present.

That can be encouraging if you are busy, restarting fitness habits, or trying to make training sustainable for the long run.

You do not need the perfect plan to begin. You need a plan you can keep doing.

If your current routine feels overwhelming, simplifying it may be the move that helps you stay consistent and keep progressing over time. Sometimes the best program is the one that fits real life.