In martial arts, the weight room has always carried an uneasy reputation. Old coaches warned against it. Traditional lineages dismissed it. Even today, well-meaning practitioners avoid lifting out of a concern that it will make them slower, stiffer, or too bulky to move freely on the mat or in the ring.
These concerns are understandable. They come from real experiences, observed in training halls over generations. But they are not well supported by modern science.
In April 2026, the American College of Sports Medicine (ACSM) published a landmark Position Stand on resistance training prescription for healthy adults. This was not a single study. It was an overview of 137 systematic reviews, synthesizing data from more than 30,000 participants across decades of research (Currier et al., 2026). The findings are comprehensive, carefully graded, and directly relevant to anyone who trains in the martial arts.
What follows is a translation of those findings for the practitioner. Not as a replacement for technical skill or mat time, but as a foundation that can sharpen what you already do.
A Long-Held Belief: Lifting Will Make You Slow and Inflexible
This concern has circulated in dojos and gyms for as long as resistance training has existed. The logic seems intuitive: muscles that are trained for size and force will become rigid, restricting the fluid movement that good technique demands.
The research does not support this conclusion.
The ACSM Position Stand found that resistance training, when performed through a complete range of motion, not only builds strength but actively supports movement quality (Currier et al., 2026). A full range of motion means moving a joint through its entire natural arc during an exercise, rather than using shortened, partial movements. The research showed that training through a complete range of motion produced greater strength gains than partial range of motion training. Importantly, this approach also preserves and may improve functional mobility, which is the ability to move freely and with control under load.
Equally relevant for martial artists is the Position Stand's finding on power training. Power training refers to resistance training in which the concentric phase of each lift, meaning the pushing or pulling phase, is performed at maximum intentional speed. The research found that this form of training improves physical function, movement velocity, and multicomponent performance outcomes. These are qualities directly tied to striking speed, takedown entries, and explosive transitions.
A separate but related insight concerns contraction velocity. The Position Stand confirmed that resistance training improves contraction velocity, which is how quickly a muscle can generate force and shorten. For a martial artist, this translates to the speed of a strike or the explosiveness of a throw.
The concern about becoming stiff from lifting is not baseless as a concept. Poorly designed training, focused only on heavy loads through short ranges, could theoretically limit mobility. But the evidence is clear: resistance training that uses full range of motion does not compromise flexibility and is associated with measurable improvements in physical function (Pallares et al., 2021, cited in Currier et al., 2026).
A Common Training Belief: You Have to Push to Complete Failure to Make Progress
Many martial artists apply the same intensity mindset to weight training that they bring to sparring or conditioning. If you are not pushing to the absolute limit, you are not working hard enough. In the context of resistance training, this often manifests as training to muscular failure, which means continuing a set of repetitions until the muscles are physically incapable of completing another one.
The ACSM Position Stand examined this question directly, drawing on multiple systematic reviews and meta-analyses. The conclusion was consistent: training to momentary muscular failure does not reliably produce greater gains in strength, muscle size, or power than stopping short of failure (Grgic et al., 2022; Vieira et al., 2021; Davies et al., 2016, all cited in Currier et al., 2026).
What this means in practice is that you can achieve the same training outcomes while finishing a set with a few repetitions still available. This concept is sometimes described using the term repetitions in reserve, or RIR. Leaving two to three repetitions in reserve means stopping a set when you estimate you could still perform two or three more with good technique. The research suggests this approach produces strength and hypertrophy, which refers to muscle growth, comparable to training to failure, while reducing accumulated fatigue and the risk of technique breakdown.
For martial artists, this matters for a specific reason. Training sessions are rarely just one thing. A day that includes weight training might also include technical drilling, pad work, sparring, or rolling. Training every resistance set to complete failure adds a recovery cost that can interfere with the quality of everything else. The science now supports a more measured approach: high effort, controlled execution, and a small buffer left in each set.
The ACSM Position Stand also noted that training to failure may carry additional risk for certain populations, particularly older practitioners, due to elevated vascular stress and an increased likelihood of technique breakdown near the end of fatiguing sets (Currier et al., 2026). For athletes who train across multiple disciplines and need to recover quickly, this is worth considering carefully.
A Common Training Belief: Only Heavy Loads Build Muscle
Resistance training load refers to the amount of weight lifted, typically expressed as a percentage of a person's one-repetition maximum, which is abbreviated as 1RM. The 1RM is the maximum weight a person can lift for a single complete repetition of a given exercise. Expressing loads as a percentage of 1RM allows comparisons across different body weights and strength levels. A load of 80% 1RM, for example, means lifting a weight equal to 80 percent of your maximum for that movement.
Traditional guidance, including the ACSM's own 2009 Position Stand, suggested that heavier loads were necessary to stimulate muscle growth. The 2026 Position Stand revises this substantially.
Across multiple systematic reviews and meta-analyses covering thousands of participants, the evidence showed that muscle hypertrophy, meaning muscle growth, was not significantly affected by load across a wide range, from low loads of approximately 30% 1RM up to very high loads near 100% 1RM (Schoenfeld et al., 2017; Lopez et al., 2021; Carvalho et al., 2022, all cited in Currier et al., 2026). What matters far more for hypertrophy is training volume, specifically the total number of sets performed per muscle group each week. The research identified that ten or more sets per muscle group per week produced meaningful hypertrophic gains, with evidence suggesting a dose-response relationship where more sets, up to a point, continue to produce additional growth.
This finding carries practical importance for practitioners who train with limited equipment, who travel frequently, or who prefer to minimize the load placed on joints during a heavy training block. Elastic band training, bodyweight training, and home-based resistance training all demonstrated statistically significant improvements in strength and hypertrophy when compared to no exercise (Currier et al., 2026). These are not inferior substitutes. They are legitimate training modalities that produce real physiological change.
The exception is strength, where load does matter. The Position Stand found that lifting at 80% 1RM or above produced superior strength gains compared to lighter loads. This aligns with the principle of specificity: if the goal is maximum voluntary strength, heavier loading is the appropriate stimulus. For general muscular development and resilience, however, the load is far more flexible than conventional wisdom has suggested.
A Common Training Belief: More Sessions Per Week Always Produces Better Results
There is a tendency in athletic training cultures to equate volume and frequency with commitment. More sessions per week, the thinking goes, means faster progress. Martial artists who already train several days per week sometimes feel they need to add equally frequent resistance training sessions to see meaningful results.
The ACSM Position Stand found a more nuanced picture. Frequency, meaning the number of resistance training sessions per week, does have a meaningful impact on strength. Training at least twice per week was identified as the effective minimum to produce significant strength gains (Currier et al., 2026). Below that threshold, progress slows. However, when total weekly volume was equated between groups training at different frequencies, the differences in strength and hypertrophy outcomes became minimal (Grgic et al., 2018; Ralston et al., 2018, cited in Currier et al., 2026).
This is an important distinction. It means that the primary driver of adaptation is not how often you train, but how much total work you accumulate. A practitioner who completes two well-structured resistance sessions per week, each containing adequate volume for the major muscle groups, can achieve results comparable to someone training four times per week with the same total sets spread across more sessions.
For martial artists managing full training schedules, this finding is genuinely practical. You do not need to add four resistance sessions per week to realize the benefits of resistance training. Two sessions, structured around the major muscle groups and delivered with appropriate effort, is sufficient to produce meaningful gains in strength, power, and physical function.
The Position Stand also confirmed that training session order matters. Placing resistance training at the beginning of a session, before technical or conditioning work, is associated with greater strength gains than placing it at the end (Currier et al., 2026). If you are combining weight training with mat time in a single session, consider sequencing the lifting first when the goal is strength development.
What the Science Actually Recommends
Bringing the ACSM findings together into a practical framework, the guidance for healthy adults across all training levels is more flexible than previous Position Stands suggested. Here is what the research actually supports.
For strength, the evidence favors training at or above 80% of your one-repetition maximum, performing two to three sets per exercise, using a complete range of motion, and training at least twice per week. Placing resistance work earlier in the training session, before technical or conditioning work, further supports strength gains.
For muscle hypertrophy, the primary driver is weekly training volume. Reaching at least ten sets per muscle group per week, distributed across your training sessions, is where meaningful growth consistently occurs. Load is flexible. Eccentric overload, which refers to placing greater emphasis on the lowering phase of a movement and controlling that phase under a heavier load, showed particular effectiveness for hypertrophy.
For power, the research supported moderate loads in the range of 30 to 70 percent of one-repetition maximum, with the concentric phase performed at maximum intentional speed. Olympic-style weightlifting movements, which include the snatch and clean-and-jerk, also demonstrated clear power benefits. Low-to-moderate total repetition volume per session preserved the speed of movement and the quality of power output.
Across all three goals, the Position Stand emphasized that progressive resistance training, which means gradually increasing the challenge placed on the muscles over time through any combination of load, volume, frequency, or exercise selection, remains a core principle. The specific method of progression is secondary. The commitment to continuing to progress is what matters.
Does the Type of Equipment Matter?
One area where the research offers clear reassurance is equipment type. The ACSM Position Stand found no significant difference in strength outcomes between machine-based and free-weight resistance training (Haugen et al., 2023, cited in Currier et al., 2026). Both produce comparable gains in maximal strength when volume and effort are equivalent.
More broadly, the data showed that elastic bands, bodyweight exercises, and home-based resistance programs all produced statistically significant improvements in strength, balance, and physical function compared to no exercise. Circuit training formats produced similar outcomes across strength and hypertrophy measures.
For the martial artist training with limited access to a fully equipped gym, traveling between training camps, or managing a joint condition that limits loading, this evidence matters. The specific equipment is less important than the consistency of the training stimulus and the progressive nature of the program.
The Broader Picture
The ACSM Position Stand closes with a conclusion that practitioners in any discipline would do well to reflect on: healthy adults, including those with no prior resistance training experience, benefit significantly from any form of resistance training compared to no resistance training at all.
Strength, muscle size, power, endurance, gait speed, balance, and the ability to perform fundamental physical tasks all improve with regular resistance training. These are not peripheral concerns for a martial artist. They are foundational to the execution of technique, the absorption of impact, injury resilience, and long-term practice.
The old beliefs, that lifting makes you slow, that you must push to total failure, that only heavy weights build muscle, and that you need to train nearly every day to see results, have all been tested against a large and growing body of evidence. They have not held up well.
Two well-designed resistance training sessions per week. Progressive effort. Full range of motion. Adequate volume. These are the principles the science supports.
The weight room is not the enemy of the martial arts. Applied with knowledge and intention, it is one of its most reliable allies.
Also in the CombatPit library: Why Strength and Conditioning Belongs in Every Martial Artist's Training
Sources
Currier BS, D'Souza AC, Fiatarone Singh MA, et al. American College of Sports Medicine Position Stand. Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance in Healthy Adults: An Overview of Reviews. Medicine and Science in Sports and Exercise. 2026;58(4):851-872.
Phillips SM, Ma JK, Rawson ES. The coming of age of resistance exercise as a primary form of exercise for health. ACSM's Health and Fitness Journal. 2023;27(6):19-25.
Morton RW, Colenso-Semple L, Phillips SM. Training for strength and hypertrophy: an evidence-based approach. Current Opinion in Physiology. 2019;10:90-95.