Based on the sources, the primary arguments for and against consistently training to muscular failure are as follows:
Arguments for Consistently Training to Muscular Failure:
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The idea that progress comes from pushing to the point of failure is ingrained in the fitness industry.
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It feels good to see a client collapse after a tough session, knowing they gave everything they had.
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Some research suggests that training to failure can maximize muscle fibre recruitment.
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For athletes focused on maximal strength, such as powerlifters, occasional training to failure may be beneficial, particularly for testing limits or during specific peaking phases.
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Some people thrive on pushing to their limits, finding a deep sense of satisfaction in grinding out the last rep.
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A casual gym-goer training twice a week might be fine pushing to failure more often, since their overall training volume is lower.
Arguments Against Consistently Training to Muscular Failure:
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New research suggests that stopping just short of failure (1-2 Repetitions In Reserve, RIR) may be just as effective for building muscle and strength.
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Training with 1-2 RIR is easier on the body and mind.
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Constantly training to failure might be doing more harm than good, particularly when it comes to long-term motivation and adherence.
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A study by Refalo et al. (2025) found that perceived discomfort (RPD) was higher in the failure condition and did not improve over time. In contrast, discomfort levels slightly decreased over time for those training with 1-2 RIR.
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Perceived exertion (RPE) also remained consistently higher in the failure condition, yet this increased effort did not lead to better results in muscle growth or strength.
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General feelings about the workout (FS) were significantly worse in the failure group, and the gap in enjoyment between the two protocols grew larger by week eight, suggesting a negative effect on long-term training adherence.
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Previous research, including a study by Refalo et al. (2024), has shown that stopping with a couple of reps in reserve leads to similar hypertrophy and strength gains as training to failure, but with less fatigue.
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For clients training for muscle hypertrophy or general strength, stopping with 1-2 RIR appears to be just as effective as failure while reducing discomfort and making workouts feel more enjoyable, potentially leading to better long-term program adherence.
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For most of their training, athletes focused on maximal strength are likely better off staying just shy of failure to allow for more training volume without excessive fatigue.
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Some individuals may find consistently pushing to failure discouraging, exhausting, or even off-putting.
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Highly motivated clients training frequently might be better served by avoiding failure most of the time to keep fatigue in check.
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Training to failure may lead to excessive fatigue, which could impact recovery and long-term adherence.
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The idea that training to failure is necessary for progress is largely a myth.
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Focusing on effective, sustainable training strategies, which may often involve stopping short of failure, is the best way to help clients reach their goals while actually looking forward to their next session.
How does training to failure compare to submaximal training regarding physiological and psychological outcomes?

Training to failure and submaximal training (stopping with 1-2 repetitions in reserve, or RIR) present different physiological and psychological outcomes according to the sources.
Regarding physiological outcomes:
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Muscle growth and strength gains appear to be similar between training to failure and stopping 1-2 reps short of failure. Previous research, including a study by Refalo et al. (2024), has shown that submaximal training leads to comparable hypertrophy and strength gains as training to failure.
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Perceived discomfort (RPD) is higher when training to failure. Interestingly, this discomfort does not improve over time, remaining consistently unpleasant even after eight weeks. In contrast, discomfort levels slightly decreased over time in the submaximal training group.
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Perceived exertion (RPE) is also consistently higher in the failure condition. This increased effort, however, does not necessarily translate to better muscle growth or strength results.
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Training to failure may lead to excessive fatigue, which could negatively impact recovery and long-term adherence. Submaximal training is described as being easier on the body.
Regarding psychological outcomes:
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General feelings about the workout (FS) are significantly worse in the failure group. While some individuals may tolerate training to failure, others report increasingly negative feelings over time. By week eight, the difference in enjoyment between the two training styles became more pronounced.
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Training to failure might have a negative effect on long-term training adherence, making people less likely to stick with their program. Submaximal training, being less exhausting and more enjoyable, may lead to better long-term consistency.
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Some clients may thrive on pushing to their limits and find satisfaction in training to failure. However, others may find it discouraging, exhausting, or even off-putting.
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The study by Refalo et al. (2025) found that experienced lifters were quite accurate in judging how many reps they had left in the tank. This suggests that individuals can effectively regulate their effort even without training to absolute failure.
In summary, while training to failure is often ingrained in fitness culture, research suggests that submaximal training (1-2 RIR) can be just as effective for muscle growth and strength, while being less uncomfortable, less fatiguing, and potentially more enjoyable, which could lead to better long-term adherence. The best approach may depend on the individual's goals, personality, motivation, and training commitment. For maximal strength athletes like powerlifters, occasional training to failure might be beneficial, but for most training, submaximal efforts are likely better. Ultimately, keeping clients consistent and enjoying the process is key.
What practical recommendations can be derived from these sources for applying training to failure?

Based on the sources, several practical recommendations can be derived for applying training to failure:
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For clients training for muscle hypertrophy or general strength, it's generally recommended to stop with 1-2 Repetitions In Reserve (RIR) as this approach appears to be just as effective as training to failure while reducing discomfort and potentially improving long-term adherence. This can make workouts more enjoyable and sustainable.
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For athletes focused on maximal strength, such as powerlifters, occasional training to failure can be beneficial, particularly for testing limits or during specific peaking phases. However, for the majority of their training, staying just shy of failure is likely the better strategy to allow for more training volume without excessive fatigue.
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Consider the individual client's personality and motivation. Some clients may thrive on pushing to their limits and find satisfaction in it, while others may find it discouraging or off-putting. Adjusting training intensity based on their preferences can help keep them motivated and committed.
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Take into account the client's training commitment. Clients training 4-5 times a week might benefit more from avoiding failure most of the time to manage fatigue. Conversely, a casual gym-goer training twice a week might be able to incorporate training to failure more often due to their lower overall training volume.
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Be aware that the idea that training to failure is necessary for progress is largely a myth. Similar muscle and strength gains can often be achieved with submaximal effort.
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Monitor perceived discomfort (RPD) and perceived exertion (RPE). Training to failure consistently leads to higher RPD and RPE that don't necessarily improve over time. If a client consistently reports high discomfort and exertion, consider incorporating more training with 1-2 RIR.
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Recognise that repeatedly pushing to failure might have a negative effect on long-term training adherence by making workouts feel less enjoyable.
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Remember that experienced trainees are generally quite accurate in judging their Repetitions In Reserve. This suggests that you can confidently instruct them to stop with a certain RIR without them significantly underestimating their effort.
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As a personal trainer, your role involves not just pushing clients hard but also keeping them training consistently and enjoying the process. Tailoring the approach to failure based on individual needs and preferences is crucial for long-term success.
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While some research indicates training to failure can maximise muscle fibre recruitment, other studies show similar hypertrophy and strength gains with submaximal effort. Therefore, the potential benefit of maximal fibre recruitment needs to be weighed against the potential drawbacks of excessive fatigue and reduced enjoyment.
In essence, the sources suggest a nuanced approach to training to failure, advocating for its judicious use based on individual goals, experience, motivation, and training frequency. For most individuals focused on general strength and hypertrophy, consistently stopping short of failure appears to be a more sustainable and equally effective strategy.