Nunes’s meta-analysis tested exercise order three different ways. Muscle growth: close to zero every time. Strength told a completely different story.
Whether they measured directly at the muscle or estimated from the outside, whether they combined the data or separated it, the effect of exercise order on muscle growth stayed close to zero: 0.03 combined. The worry is probably misplaced.
Eleven studies. Two hundred sixty-eight people. Programs lasting six to twelve weeks. Nunes and colleagues pooled the training trials on exercise order they found, and seven of them measured muscle growth. The combined difference was 0.03 on a standardized scale, with a 95% range from −0.26 to 0.31.
But the title promised "stronger." The same dataset told a completely different story about strength.
Eleven studies asked whether exercise order changes strength and muscle growth. For growth, pooling the seven that measured it showed no significant difference. But it does change which exercise gets stronger fastest, in a pattern nobody expected.
- The researchers tested the growth question three separate ways, and every method returned the same answer: no significant effect.
- The exercise you perform first in your session gets a measurable strength advantage that holds across machines and free weights.
- Isolation exercises like curls benefit from going first nearly twice as much as compound movements like bench press.
- The world’s largest sports medicine body confirmed both findings in its first guideline update in seventeen years.
Three Ways of Measuring, One Near-Zero Answer
The researchers tested the hypertrophy question three different ways. They measured muscle thickness directly with ultrasound. They estimated it through body composition measures. They combined both methods into a single analysis.
Every method returned the same answer. Direct measurement: negative 0.02 on the standardized scale. Indirect: 0.06. Combined: 0.03. None was significant, and the studies showed no measurable disagreement (zero heterogeneity), though that is not the same as every study pointing the same way.
Then the significance test. It came back at p=0.862. Researchers need to clear 0.05 to claim a real effect exists. This result was not a borderline call, not a trend toward something. The authors' reading: similar muscle growth can be attained regardless of exercise order, though the small number of studies calls for more research.
If you have ever restructured your session because a bench was taken and wondered mid-set whether you just wasted the workout, the evidence says the worry is probably misplaced.
The Variable Nobody Separated
The headline finding is clear: exercise order made no significant difference to whether muscles grow. But the same dataset exposed something else entirely.
When the researchers separated strength gains by exercise type, a pattern appeared. Compound movements gained more strength when performed first in the session. Isolation exercises did too, independently. The effect was significant whether people used machines or free weights.
Whichever exercise comes first in the session gets the strength advantage. Not overall strength in some general sense, but strength on that specific movement. Bench press first means bench press improves more. Curls first means curls improve more.
The data follows what exercise scientists call the specificity principle: your body adapts most to the conditions you train under. The overall strength analysis had masked this because gains in first-position exercises and reduced gains in last-position exercises canceled each other out.
Isolation Lifts Benefit Nearly Twice as Much
Here is where the data turns counter-intuitive. Most lifters would guess that compound movements respond more to being prioritized, since they involve more muscle and more total load. The data showed the opposite.
The strength advantage from going first was nearly twice as large for single-joint exercises like curls and extensions as it was for multi-joint movements like bench press and rows. In effect sizes, that is 0.58 against 0.32; the paper did not test whether the two differ.
Think about what that means if you always save curls for last. You are leaving the biggest order-dependent strength gains on the table for the exercises you deprioritize the most. The authors point to fatigue: an exercise done first tends to lower performance in the exercises that follow, especially those using the same muscles.
Whether isolation adds total size is a separate question — seven studies comparing compound to isolation exercises found similar overall growth. But one of those studies went deeper and found that a compound and an isolation exercise each grew different heads of the same triceps more — the benefit of going first may be less about how much and more about where.
The first exercise in a session gets a measurable strength boost. Single-joint exercises benefit almost twice as much from that position as compound movements. For muscle growth, the effect is 0.03, not significant.
Seventeen Years of One Recommendation
In 2009, the American College of Sports Medicine published its resistance training position stand. The recommendation: perform multi-joint exercises before single-joint exercises. Evidence level: C, based entirely on short-term studies measuring single-session performance, not long-term gains. [1]
Nunes and colleagues published the first quantitative review of long-term exercise order effects in 2021. The split verdict emerged: no significant effect for growth, a real one for strength.
Then in 2026, the ACSM released its first update to those guidelines in seventeen years. The new position stand synthesized 137 systematic reviews. Exercise order does not appear on the list of factors that enhance muscle growth. For strength, the opposite: performing an exercise first enhances gains. Both conclusions received high confidence ratings, 81 and 88 percent respectively.
Anyone who treats "compounds first" as a universal rule is following advice from the 2009 version. The field has moved.
Muscles That Assist vs Muscles That Drive
There is an honest boundary in this evidence. In the studies that measured muscle growth directly with ultrasound, most of the muscles they tracked, such as the biceps, are primary drivers of isolation exercises like curls, but only assist during compound movements like lat pulldowns.
That means, the authors write, the hypertrophy data may only show that doing a compound exercise first does not affect growth in a muscle that merely assists in it. Whether exercise order affects growth in the large muscles that power compound movements has barely been tested. One study examined quadriceps growth directly and found similar growth after six weeks. But one study is not eleven.
Every way the researchers re-sliced the data gave the same null result. Removing the study that used skinfolds did not change the result to a meaningful degree. Substituting different outcome measures from the same study left it consistent. The effect stayed between 0.02 and 0.07, none of them significant.
The same principle appeared in earlier research, part of it included in this meta-analysis. A 2012 review by Simão and colleagues established the specificity effect at the individual-study level. [2] A controlled twelve-week trial by the same group, one of the eleven here, found that upper-body muscle thickness grew equally regardless of exercise order across 31 participants. [3]
What to Do When the Squat Rack Is Taken
Eleven studies. One split verdict. A clean decision rule.
If you want a specific exercise to get stronger, do it first. This is a real effect, confirmed across machines and free weights, with single-joint exercises responding nearly twice as strongly as multi-joint movements. For competitive strength athletes, this means structuring sessions around the lifts they need to improve most.
If you only care about muscle growth, the evidence says order is unlikely to matter: the combined effect across the seven studies that measured growth, and every analysis method, was close to zero (0.03). The authors still call for more studies, especially on the large muscles that drive compound lifts.
The squat rack is taken. Start with whatever is available. Your growth should not suffer. The only thing that changes is which exercise gets the strength bonus, and now you know that is a choice you can make deliberately rather than a mistake you make accidentally.
This finding does not ask you to change your program, buy new equipment, or learn a new technique. For muscle growth, the research found no significant effect of exercise order. Do whatever is available.
For strength, one small choice: if there is a specific lift you want to get stronger at, do it first. That is the entire adjustment. No overhaul required.
What other research found
What this means for you
The meta-analysis found that exercise order has no significant effect on muscle growth. The combined difference across every analysis method was close to zero, with no measurable disagreement between studies.
That session you rearranged because the squat rack was taken? Probably nothing was lost. The evidence suggests similar growth regardless of which exercise came first.
The specificity finding has real implications for competition preparation. The strength advantage from performing an exercise first was statistically significant across all exercises, machines and free weights, though some analyses showed moderate disagreement between studies, and the researchers noted it may have particularly high practical importance for powerlifters and weightlifters.
One honest caveat: every study measured strength using the same exercises people trained with. Whether this advantage extends to a different type of strength test remains unknown. The effect is real, but it may partly reflect how closely the test matched the training.
The two findings combine into a simple rule. Muscle growth was not significantly affected by exercise order, so arrange your session around whichever lift you want to get stronger at. Put that exercise first.
Everything else can go in any order without a measurable cost to muscle development. One sequencing choice, no measurable cost to growth. For strength, the specificity effect held whether people used machines or free weights.
Before you change anything
Eight of eleven studies used untrained participants. The people in these studies were new to resistance training, which means the results are strongest for beginners and those returning to the gym after a break.
Only three studies included people with training experience. The sex balance was also uneven: most studies tested only men. The paper's text counts eight male-only studies, two female-only and one mixed, though its own table lists one of the eight (Cardozo) as older women. Whether the specificity effect differs between sexes is still an open question.
Participants ranged from young adults to older adults (60 and over), and the studies lasted nine weeks on average (six to twelve).
Every strength test used the same exercises people trained with. If someone trained bench press, they were tested on bench press. This may inflate how large the order effect appears, because the test itself is specific to the training.
No study tested whether exercise order affects strength measured a different way, like pushing against a fixed surface or squeezing at a constant speed. The strength advantage of going first might look smaller with a different test.
All studies lasted six to twelve weeks. Whether the order effect persists, grows, or disappears over months of training is unknown.
The hypertrophy finding is consistent but rests on few studies. The studies showed no measurable disagreement. Every analysis method returned the same near-zero answer. Every sensitivity check gave the same result. If exercise order affects muscle growth, the seven studies that measured it, across three measurement approaches, failed to detect it — and the authors call for more research.
The strength finding deserves moderate confidence. The specificity effect is real and statistically significant, but some analyses showed moderate disagreement between studies. The wider range of results for isolation exercises suggests the effect may vary depending on the specific exercise and population.
The next time the gym is crowded and your plan falls apart, that moment will feel different. The growth question has a clear answer, for now.
But if exercise order makes no significant difference to muscle growth, what about the equipment? Does a machine build the same muscle as a barbell? Does it matter whether you go through the full range of motion or stop short? The answers turned out to be just as counter-intuitive.
What This Study Found
All findings from this paper, in plain language.
- When researchers combined all strength tests together, the two exercise orders produced the same results, because larger gains in first-position exercises and smaller gains in last-position exercises offset each other.
- Compound exercises like bench press gained more strength when they were performed at the beginning of the workout rather than the end.
- Isolation exercises like curls gained nearly twice as much strength from going first compared to compound movements.
- Whichever exercise came first in the session got the strength boost, regardless of whether it was done on a machine or with free weights.
- Exercise order had no significant effect on muscle growth no matter how the researchers measured it, with no measurable disagreement between studies.
- All eleven studies scored well on a quality checklist, with eight rated excellent and three rated good.
- The strength benefit of going first may matter most for competitive lifters who need to improve specific lifts for competition.
- Fatigue from earlier exercises reduces performance on later exercises, which is why the first exercise in a session gains the most strength over time.
- Every study tested strength using the same exercises people trained with, which may have made the order effect look larger than it would with a different test.
- The muscles measured for growth were helper muscles in compound exercises, not the large muscles that drive them, leaving a gap in what the evidence covers.
- Removing a study or swapping measurement methods did not change the growth finding meaningfully.
- The standard recommendation to do compound exercises first was based on short-term performance studies only, not on weeks of actual training.