Squeezing your glutes through simple, unloaded contractions can produce small but measurable gains in both strength and size. An eight-week study found that performing gluteal squeezes alone increased hip girth at the widest point by about 1.2 cm on average and boosted strength by roughly 16 percent. That said, the effect is modest compared to what loaded exercises deliver, and the practical ceiling for squeeze-only training is low. The real story involves how isometric contractions interact with muscle growth, where bodyweight squeezes fit alongside heavier movements, and why the gluteus maximus responds the way it does.
What the Squeeze Study Actually Found
The most directly relevant research is a controlled trial published in PeerJ that compared gluteal squeezes to glute bridges over eight weeks of training. Participants in the squeeze group performed maximal voluntary contractions of the glutes while standing, with no external load. By the end of the study, they had increased gluteal girth at the level of the greater trochanter by 1.24 cm on average. They also gained about 16 percent in bilateral gluteal strength. Interestingly, the measurements taken 5 cm above and below the widest point actually showed slight decreases in girth, though those changes were not statistically firm.1PeerJ. The effects of gluteal squeezes compared to bilateral bridges on gluteal strength, power, endurance, and girth
The bridge group in that same study also gained strength and size, and the two groups ended up with comparable results on most measures. The takeaway is not that squeezes are a magic shortcut. It is that the glutes respond to isometric effort even without weights, at least in people who are starting from a relatively untrained baseline. If you have been sedentary and simply start squeezing your glutes deliberately throughout the day or during standing holds, you can expect some early adaptation. Whether those gains continue beyond the first couple of months is another question entirely.
How Isometric Contractions Trigger Growth
A glute squeeze is an isometric contraction, meaning the muscle fires without actually moving through a range of motion. People tend to assume that muscles only grow when you move a heavy weight through space, but systematic reviews of isometric training show that is not quite right. Isometric work can produce real hypertrophy, though the rate of growth depends heavily on the muscle’s length during the contraction and the intensity of effort.2PubMed. Isometric training and long-term adaptations: Effects of muscle length, intensity, and intent: A systematic review
Research on this topic consistently shows that isometric holds performed at longer muscle lengths produce more hypertrophy than holds at shorter lengths. When you stand and squeeze your glutes as hard as possible, your hips are in a neutral or slightly extended position, which means the gluteus maximus is at a relatively short length. That is not the worst position for generating force, but it is not the best position for stimulating growth either. Exercises that load the glutes in a stretched position, like deep squats or Romanian deadlifts, tend to have an advantage here because the muscle is under tension while lengthened.
This matters practically. Squeezes are not zero, but they are working against a biomechanical limitation: the muscle is close to fully shortened when you contract it in a standing position. Gravity is not providing meaningful resistance. Your body weight is not traveling through a challenging range. So the growth stimulus, while real, is on the lower end of what the muscle is capable of responding to.
How Squeezes Compare on Muscle Activation
Electromyography (EMG) studies offer another way to compare exercises. EMG measures the electrical activity in a muscle during a contraction, which serves as a rough proxy for how hard the muscle is working. A study comparing several glute exercises found that a half-kneeling glute squeeze and a resisted knee split both produced gluteus maximus activation on par with the hip thrust, and significantly more than a split squat. The differences between the squeeze-type exercises and the hip thrust were not statistically meaningful.3PubMed Central. How to activate the glutes best? Peak muscle activity of acceleration-specific pre-activation and traditional strength training exercises
That result surprises people who assume you need a barbell across your hips to fire the glutes hard. In terms of peak activation, certain squeeze variations can match loaded movements. But peak activation during a single rep and total growth stimulus over weeks of training are not the same thing. A single high-intensity squeeze fires the muscle, but the total volume of work, the mechanical tension over time, and the progressive overload you can add all favor exercises where you can incrementally increase the load.
A systematic review of gluteus maximus activation across dozens of common exercises found that the movements producing “very high” levels of activation (above 60 percent of a maximal voluntary contraction) included step-ups and their variations, hip thrusts, deadlifts, lunges, and squats. Step-ups came out on top, followed by loaded hip-hinge and squat variations.4PubMed Central. Gluteus Maximus Activation during Common Strength and Hypertrophy Exercises: A Systematic Review Bodyweight squeezes were not included in that review, but the pattern is clear: exercises that combine high activation with external load and a full range of motion dominate the rankings for long-term growth.
Do Hip Thrusts or Squats Grow the Glutes More?
If squeezes offer only modest growth, what about the two exercises most commonly recommended for building the glutes? A head-to-head trial compared back squats and hip thrusts over a training block, using MRI to measure cross-sectional area of the gluteal muscles before and after. Both exercises produced similar hypertrophy across the lower, mid, and upper portions of the glutes. Point estimates slightly favored the hip thrust at every measurement level, but the differences were small and easily within the range of normal variation between individuals.5PubMed Central. Hip thrust and back squat training elicit similar gluteus muscle hypertrophy and transfer similarly to the deadlift
The practical lesson from this study is that both exercises work, and the differences between them are much smaller than the fitness industry’s tribal debates would suggest. What matters more than the specific exercise is that you are loading the glutes progressively with enough volume and intensity to force adaptation. A simple squeeze provides none of the progressive overload that a squat rack or a loaded barbell does, which is why the ceiling for squeeze-only growth is low even though the floor is not zero.
Squeezes as an Activation Tool
Where glute squeezes genuinely shine is as a warm-up or activation drill before heavier training. Research on gluteal activation warm-ups found something counterintuitive: after a set of targeted glute activation exercises, EMG activity during explosive movements actually decreased even though estimated muscle force trended upward. The likely explanation is that the activation drills increased corticomotor excitability, essentially priming the neuromuscular system to recruit the glutes more efficiently with less neural effort.6BMJ Open Sport & Exercise Medicine. Effect of a gluteal activation warm-up on explosive exercise performance
This finding has real implications for people who feel like their glutes “don’t fire” during squats or deadlifts. A few sets of deliberate squeezes or banded clamshells before your working sets can improve how well your nervous system recruits the glutes during the heavier movements that actually drive growth. Think of squeezes less as a muscle-building exercise and more as a way to wake the muscle up so that the exercises which do build muscle can do their job more effectively.
The concept of a mind-muscle connection fits here, too. Directing your attention internally toward the muscle you are trying to work has been discussed as a strategy for maximizing hypertrophy-oriented training.7Strength & Conditioning Journal. Attentional Focus for Maximizing Muscle Development: The Mind-Muscle Connection Squeezes are arguably the purest form of this: you are doing nothing except focusing on contracting one muscle group as hard as possible. For people who struggle to “feel” their glutes during compound lifts, practicing deliberate squeezes can help build that neural pathway.
Why the Glutes Are Hard to Grow (for Some People)
Not everyone responds equally to glute training, and anatomy is a big reason why. The gluteus maximus is not a single uniform slab. Its upper and lower portions have different fiber lengths, different attachment points, and different mechanical roles. The superior portion, which makes up roughly three-quarters of the muscle’s cross-sectional area, attaches broadly across the iliac crest, sacrum, and thoracolumbar fascia before inserting via a thick tendon near the greater trochanter. The smaller inferior portion originates from the lower sacrum and coccyx and has longer muscle fibers.8PubMed. Anatomy and biomechanics of gluteus maximus and the thoracolumbar fascia at the sacroiliac joint
Because these portions differ in fiber architecture, they respond somewhat differently to various exercises. A simple standing squeeze contracts the whole muscle, but the degree of activation across regions depends on hip position, pelvic tilt, and how the person distributes effort. People with naturally higher levels of gluteal adipose tissue may see visible changes faster because even small hypertrophy pushes the shape outward, while leaner individuals may need more total growth before a difference is apparent.
Body fat distribution, pelvic width, femoral neck angle, and the exact attachment geometry of the muscle all vary meaningfully between individuals. Two people doing the same program can get different visual results even if the underlying muscle growth is identical. This is why glute training advice that works spectacularly for one person sometimes feels useless to another. Genetics set the starting canvas; training determines how much you paint on it.
Posture, Pelvic Tilt, and the Glutes You Already Have
Sometimes the issue is not that the glutes are too small but that posture is hiding what is already there. Anterior pelvic tilt, where the pelvis tips forward and the lower back arches excessively, can make the glutes appear flatter even when the muscle itself is reasonably developed. Correcting pelvic position involves coordinated activation of the abdominals, lower back muscles, and glutes. Research exploring different strategies for pelvic correction found that while people used a variety of muscle activation patterns, the gluteus maximus was involved in every single one and had the strongest correlation with changes in pelvic tilt.9PubMed Central. Muscular Strategies for Correcting the Pelvic Position to Improve Posture-An Exploratory Study
This means that practicing glute squeezes throughout the day, especially while standing, can improve how your pelvis sits even if the hypertrophy effect is small. A more neutral pelvis tilts the glutes into a position where they project more posteriorly, which can change their appearance without any actual muscle growth at all. For someone who spends long hours sitting and has developed a habitual anterior tilt, simply learning to engage the glutes and tuck the pelvis can create a visible difference within days. It is not real growth, but it looks like it.
Where Squeezes Make Sense in a Program
If your goal is genuinely to build a bigger, rounder butt, squeezes alone will not get you there. They belong in two specific roles within a larger program:
- Activation drill: Two to three sets of hard squeezes or half-kneeling squeeze holds before your main workout to prime the glutes for heavier work.
- Low-threshold daily practice: Brief, deliberate squeezes during the day (waiting in line, standing at a desk) to reinforce the neural connection, especially if you are recovering from injury or coming back from a long sedentary period.
For actual growth, you need exercises that allow progressive overload. The research points consistently toward compound, loaded movements as the drivers of gluteal hypertrophy. Step-ups, hip thrusts, squats, deadlifts, and lunges all produce very high levels of gluteal activation and, critically, they allow you to add weight over time.4PubMed Central. Gluteus Maximus Activation during Common Strength and Hypertrophy Exercises: A Systematic Review The squeeze can complement these, but it cannot replace them.
People recovering from hip or knee injuries sometimes rely on isometric glute work as a bridge back to loaded training, and in that context, squeezes are genuinely valuable. They maintain some activation and can slow the rate of muscle loss during a period when full-range exercises are off the table. But calling them a muscle-building strategy in the same breath as barbell hip thrusts overstates what they can do.
The Evolutionary Reason Your Glutes Are Built to Be Big
The gluteus maximus in humans is dramatically larger than in other primates, and its size is not an accident or a purely aesthetic feature. Compared to apes, the human version underwent major changes in volume and mechanical leverage as our ancestors adapted to upright walking and distance running. The shift to bipedal locomotion required a muscle that could powerfully extend the hip and stabilize the trunk over a single supporting leg with each stride.10PubMed Central. Evolution of the human hip. Part 2: muscling the double extension
Research specifically examining the gluteus maximus during locomotion has confirmed that the muscle is relatively quiet during casual walking but becomes highly active during running, climbing, and any explosive hip extension.11PubMed. The human gluteus maximus and its role in running This evolutionary design means the muscle responds best to activities that resemble its original job: powerful, loaded hip extension against resistance. Sprinting, climbing stairs under load, and heavy hip-hinge movements are all closer to the stimulus the glute max evolved to handle than a simple isometric squeeze while standing still. The muscle has the capacity to be the largest in the human body, and it was shaped by millions of years of vigorous locomotion, not gentle contractions at a standing desk.
None of this means squeezes are worthless. They are a legitimate entry point for someone who has never thought about their glutes, a useful warm-up for someone chasing heavier lifts, and a reasonable maintenance tool during rehab. But expecting them to transform the shape of your backside on their own is a bit like expecting push-ups against a wall to build a massive chest. The muscle will notice, briefly, and then it will need something more.