Should You Train to Failure to Build Muscle?

You do not need to take every set to muscular failure to build muscle.

Current evidence suggests that muscle growth generally benefits from performing sets reasonably close to failure, but reaching absolute failure on every set does not consistently produce better results. For most exercises and most lifters, finishing a set with approximately 1–3 repetitions in reserve (RIR) can provide a strong hypertrophy stimulus while making fatigue easier to manage.

Training to failure can still be useful particularly on selected isolation exercises, lighter-load sets or the final set of an exercise but it should be treated as a tool rather than a rule.

What Is Muscular Failure?

Momentary muscular failure occurs when you cannot complete another full repetition with acceptable technique despite attempting to do so.

This is different from simply stopping because a set feels uncomfortable. It is also different from technical failure, where you may still be able to move the weight, but only by significantly changing your technique.

Repetitions in reserve provide a practical way to describe proximity to failure:

3 RIR: You could have completed approximately three more repetitions.
2 RIR: You had around two repetitions remaining.
1 RIR: You probably had one good repetition left.
0 RIR: You reached muscular failure.

RIR is an estimate, not a perfectly precise measurement. Newer lifters frequently stop further from failure than they believe, so learning to judge effort accurately is an important training skill.

Why Does Proximity to Failure Matter?

A muscle grows when it is repeatedly exposed to sufficient mechanical tension and then given the opportunity to recover and adapt.

As a set becomes more difficult, the body recruits additional motor units to maintain force. This is one reason why the repetitions performed near the end of a challenging set may be particularly valuable for hypertrophy.

However, this does not mean that only the final repetition matters or that every set must reach failure.

Muscle growth is influenced by the overall training programme, including:

Weekly training volume
Exercise selection
Load and repetition range
Proximity to failure
Progression over time
Sleep, nutrition and recovery

Failure is therefore only one variable within a much larger system.

What Does the Research Say?

A 2022 systematic review and meta-analysis concluded that training to muscular failure was not required for increasing strength or muscle size. Some subgroup findings suggested a small potential hypertrophy advantage among resistance-trained participants, but the authors emphasised the limited evidence and need for more research. (1)

A later systematic review examined 15 studies comparing different proximities to failure. It found no clear evidence that reaching momentary muscular failure was superior to stopping before failure. The researchers also highlighted major limitations, including inconsistent definitions of failure and uncertainty about how many repetitions participants actually had remaining. (2)

A 2024 meta regression added an important detail: muscle growth tended to improve as sets were performed closer to failure, while strength gains were less clearly affected by proximity to failure. However, the analysis was exploratory and could not identify a precise “optimal” RIR for every exercise or individual. (3)

An eight-week study comparing quadriceps training at approximately 1–2 RIR with training to failure found similar muscle growth between conditions. The failure condition produced greater repetition loss during the sessions, suggesting more acute fatigue without a clear additional hypertrophy benefit. (4)

More recent research remains consistent with the idea that failure is not automatically superior. A 2025 single set study found that failure training may modestly improve certain hypertrophy measurements, but it did not improve every outcome and did not produce superior strength gains. (5)

Taken together, the evidence supports a balanced conclusion:

Getting close enough to failure appears important for maximizing muscle growth, but reaching failure on every set is probably unnecessary.

The Cost of Training to Failure

A failure set does not only create a muscular stimulus. It also produces fatigue.

Frequently reaching failure can result in:

Greater repetition loss across subsequent sets
Reduced performance later in the session
More perceived discomfort
Increased recovery demands
Greater likelihood of technique deterioration
Difficulty maintaining sufficient weekly training volume

This becomes particularly important during demanding compound exercises. Taking a squat, Romanian deadlift or free-weight press to failure may generate considerably more systemic and technical fatigue than taking a machine curl or lateral raise to failure.

Therefore, the value of failure training depends partly on its stimulus to fatigue ratio.

Does the Load Make a Difference?

Training close to failure may be especially important when using lighter loads.

With a relatively heavy weight, a high level of muscle fiber recruitment is required from the beginning of the set. With lighter weights, a lifter may need to perform more repetitions and get closer to failure before recruiting enough available motor units to create a comparable stimulus.

Research shows that both relatively light and heavy loads can stimulate muscle growth when sets are sufficiently challenging. However, light-load training tends to be less time-efficient and considerably more uncomfortable when taken to failure. (6)

This does not mean every high repetition set must reach absolute failure. It means that stopping a set of 20 repetitions while you could still perform another eight is unlikely to provide the same stimulus as stopping with only one or two remaining.

A Practical Approach

For most people training primarily for muscle growth, the following system offers a sensible starting point.

Compound exercises

Examples include squats, presses, rows and deadlift variations.

Aim to finish most working sets at approximately 1–3 RIR. This keeps the sets challenging while helping preserve technique and performance across the workout.

Failure can occasionally occur, but it should not be the default target especially on technically demanding free-weight exercises.

Machine and isolation exercises

Examples include leg extensions, hamstring curls, lateral raises and cable curls.

These exercises generally create less systemic fatigue and are often safer to take close to failure. Most sets can remain around 1–2 RIR, with the final set occasionally taken to technical or muscular failure.

Beginners

Beginners do not need to train to failure. Their first priority should be learning movement technique, building consistency and understanding how difficult a productive set should feel.

Starting around 2–4 RIR is reasonable. As technique and confidence improve, selected sets can gradually move closer to failure.

Advanced lifters

Experienced trainees may benefit from using a wider range of effort levels across the week. They can deliberately place failure sets where they provide the most value while managing fatigue elsewhere.

For example:

First compound set: 2–3 RIR
Later compound sets: 1–2 RIR
Isolation sets: 1 RIR
Final isolation set: 0 RIR when appropriate

This is only an example, not a universal prescription.

You May Be Further From Failure Than You Think

One practical limitation of RIR based training is that people are not always good at estimating how many repetitions they have left.

If every set ends when the repetitions are still fast and comfortable, labelling it “2 RIR” does not make it a hard set. Conversely, a repetition slowing down does not automatically mean failure has been reached.

Occasionally performing a controlled failure set on a relatively safe exercise can help calibrate your RIR estimates. Once you know what true failure feels like, you can use non-failure training more accurately.

This calibration should be done carefully and does not need to happen during every workout.

Common Mistakes

Taking every set to failure

This can reduce the quality of later sets and make recovery unnecessarily difficult.

Never getting close to failure

Consistently stopping sets when many repetitions remain may provide an insufficient hypertrophy stimulus.

Sacrificing technique to reach “failure”

If your technique changes substantially, the target muscle may no longer be the limiting factor. Technical failure is usually a better stopping point than forcing another poor repetition.

Using the same RIR target for every exercise

A failure set of cable curls does not carry the same fatigue or risk as a failure set of barbell squats. Exercise selection matters.

Ignoring total training volume

A single brutal set cannot compensate for an inconsistent or poorly structured training programme.

BWS Practical Takeaway

You do not have to destroy the muscle to make it grow.

For most hypertrophy training:

Perform the majority of working sets within approximately 1–3 RIR.

Use failure more selectively on stable machine and isolation exercises.
Avoid making failure the default on technically demanding compound lifts.

Get closer to failure when using lighter loads.

Track performance and progress instead of judging workouts only by exhaustion.

Adjust effort according to your experience, recovery and training volume.

The goal is not to make every set as difficult as possible. The goal is to create enough stimulus to progress and then recover well enough to repeat that process consistently.

References

1- Grgic J, Schoenfeld BJ, Orazem J, Sabol F. Effects of resistance training performed to repetition failure or non-failure on muscular strength and hypertrophy: a systematic review and meta-analysis. Journal of Sport and Health Science. 2022;11(2):202–211. PubMed 2- Refalo MC, Helms ER, Trexler ET, Hamilton DL, Fyfe JJ. Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine. 2023;53:649–665. PubMed 3-Robinson ZP, Pelland JC, Remmert JF, et al. Exploring the dose-response relationship between estimated resistance training proximity to failure, strength gain, and muscle hypertrophy: a series of meta-regressions. Sports Medicine. 2024. PubMed 4-Refalo MC, et al. Similar muscle hypertrophy following eight weeks of resistance training to momentary muscular failure or with repetitions in reserve. Journal of Sports Sciences. 2024. PubMed 5-Hermann T, et al. Muscular adaptations in single-set resistance training performed to failure or with repetitions in reserve. 2025. PubMed 6-Schoenfeld BJ, Peterson MD, Ogborn D, Contreras B, Sonmez GT. Effects of low- versus high-load resistance training on muscle strength and hypertrophy in well-trained men. Journal of Strength and Conditioning Research. 2015;29(10):2954–2963. PubMed

This article is for educational purposes and does not replace personalized medical, physiotherapy or exercise advice.