Your glutes do more than shape your backside — they stabilize your pelvis and power nearly every hip movement you make, so when they're weak, other body parts end up covering for them.
The five clearest signs are a hip that dips or sways when you walk or balance on one leg, a knee that caves inward during squats or landings, low back pain paired with an arched posture, hamstrings that cramp or take over during bridges, and pain or difficulty that shows up in your knees, shins, or when using stairs and chairs.
Keep reading for a closer look at what each sign means and how to check for it yourself.
Why Your Glutes Matter More Than You Think
Your glutes aren't one muscle doing one job. It's a group of three, each with a distinct role in keeping your hips and pelvis working the way they should:
- Gluteus maximus: the largest and most powerful muscle in your body, responsible for extending your hip (think standing up, climbing stairs, sprinting) and rotating it outward
- Gluteus medius and minimus: smaller muscles on the side of your hip that abduct your leg and, more importantly, keep your pelvis level whenever you're standing or moving on one leg
That pelvic-stabilizing job matters more than it sounds like it should. Every time you walk, run, or climb a step, you spend a good chunk of that motion balanced on a single leg while the other one swings through. Your hip abductors are what keep you from tipping over during that split second.
When any of these muscles can't do their job well, your body doesn't just stop moving. It finds a workaround. Your low back arches more to make up for a hip that won't extend fully.
Your hamstrings jump in to finish hip extension your glutes should be handling. Your knee drifts inward because your hip can't control the position of your thigh. Your IT band tightens up trying to stabilize a leg your glutes have left unsupported.
None of these compensations are sustainable long-term. They ask muscles and tissues to do jobs they weren't built for, and that extra strain is exactly what shows up as pain, fatigue, or dysfunction elsewhere in the body.
This is the thread running through every sign covered below — each one is a different structure stepping in for glutes that aren't pulling their weight.
Sign 1 — Your Hips Sway or Dip When You Walk or Balance
Watch someone walk and you can often spot this from across the room. Their hips appear to sway side to side with each step, or one hip visibly drops as weight shifts onto that leg.
Ask that same person to stand on one leg, and you'll usually see the same instability: they wobble, put the raised foot down quickly, or lean their upper body over the standing leg just to stay upright.
This comes down to timing. About 60% of your walking cycle is spent with a foot on the ground, and roughly 40% of that is single-limb support — one leg bearing your full weight while the other swings forward. Your gluteus medius and minimus are what hold your pelvis level during that window.
When they're too weak to generate enough force, gravity wins, and the pelvis on the swinging-leg side drops instead of staying level.
Clinically, this drop has a name: the Trendelenburg sign. It's the most cited marker of gluteus medius weakness, and it's not just a gait quirk — a study comparing 150 people with chronic low-back pain to 75 pain-free controls found the gluteus medius was significantly weaker in the low-back-pain group, and the Trendelenburg sign showed up far more often in that group too. Weak hip abductors and back pain, in other words, tend to travel together.
Test it yourself:
- Stand facing a mirror, hands off any support
- Lift one knee to roughly hip height, like you're marching in place
- Hold for up to 30 seconds, watching your waistband or belt line
- Repeat on the other side
If your waistband dips below level on the lifted-leg side — or you find yourself leaning or hopping to keep balance — that's a sign the standing leg's hip abductors aren't doing their job. Just keep in mind this is a movement screen, not a diagnosis; pain, poor balance, or other conditions can also throw off the result.
Sign 2 — Your Knee Caves Inward During Squats or Landings
Drop into a squat, step down off a curb, or land from a jump, and pay attention to where your kneecap goes. If it drifts inward toward your other leg instead of tracking over your second toe, you're looking at dynamic knee valgus — a pattern that shows up on one side more than the other for a lot of people, and one that puts extra stress on the knee joint and its surrounding ligaments every time it happens.
The proposed explanation centers on your gluteus maximus and medius. Together, they're supposed to control your thigh bone's rotation and position as you descend into a squat or absorb the impact of landing.
When they underperform, nothing stops the thigh from rolling inward and rotating — and the knee, being at the bottom of that chain, caves in as a result.
That said, this is the one sign where the science gets genuinely murky:
- Some research supports the glute-weakness explanation and backs strengthening work as a fix
- Other studies found the opposite — people who showed knee valgus actually tested as having more hip strength, not less
- A systematic review turned up inconsistent results overall
- Ankle mobility restrictions can produce the same visual pattern independent of hip strength
The takeaway: knee cave is worth investigating, not treating as confirmed proof of weak glutes on its own.
Test it yourself:
- Film a slow single-leg squat or step-down (off a low step) from the front, going to about 30 degrees of knee bend, and watch whether the kneecap dives inward relative to your foot
- Try a bodyweight squat with a resistance band looped around your thighs — the goal is to keep your knees pressed outward against the band; struggling to do so is a common way this same control issue shows up in a training setting
Sign 3 — Low Back Pain Paired With an Arched, “Swayback” Posture
This one's visible even standing still. The pelvis tilts forward, the lower back curves into an exaggerated arch, and the belly and buttocks both push outward as a result.
It's often described as a “swayback” posture, and it tends to come with a dull, persistent ache in the low back that gets worse after standing, walking, or lifting.
The mechanism behind it is a tug-of-war between muscle groups. Your gluteus maximus is a key hip extensor and pelvic stabilizer, but prolonged sitting weakens and deconditions it over time.
Meanwhile, your hip flexors — the muscles on the front of your hip that spend all day shortened in a seated position — get tight and start pulling your pelvis forward into that anterior tilt.
Clinically, this tight-hip-flexor, weak-glute combination is known as lower crossed syndrome. With your glutes not pulling their weight on hip extension, your lumbar erector spinae — the muscles running along your spine — end up overworking to pick up the slack and stabilize your trunk, which is exactly the kind of chronic overload that turns into pain.
The research backs up the connection. The same study that compared 150 people with chronic low-back pain to 75 pain-free controls found gluteus medius weakness was significantly more common in the low-back-pain group.
Clinical trials have also found that adding hip and glute strengthening to standard low-back care improves both pain and disability. It's worth noting some researchers think this model gets overstated, so treat it as one contributing factor rather than the sole cause of every case of back pain.
Test it yourself:
- Place your hands on your iliac crests — the bony ridges at the top of your pelvis, just below your waist — and check their angle. If they tilt noticeably forward and downward while your lower back shows a pronounced arch, that points toward an anterior pelvic tilt
- Lie flat on your back and notice the gap between your lower back and the floor. An unusually large gap is another rough sign of the same pattern
Sign 4 — Your Hamstrings or Low Back Take Over During Glute Exercises
You'd expect a glute bridge or hip thrust to be felt in your glutes. If instead you feel a cramp building in your hamstrings, or your lower back seems to be doing most of the work, that's your body telling you something.
The same thing often happens during deadlifts or simply bending to pick something up — your hamstrings and back seem to carry the whole movement while your glutes stay quiet.
Your hamstrings cross two joints and assist with hip extension, but they're built to assist, not lead. When your gluteus maximus doesn't fire strongly or quickly enough, your hamstrings get pulled into double duty: extending your hip and stabilizing it, jobs they weren't designed to handle simultaneously. That overload is exactly why they cramp, fatigue fast, or feel chronically tight no matter how much you stretch them.
This isn't just a feeling — it shows up on EMG testing, too. Studies looking at prone hip extension in people with low-back pain found altered muscle activation, including hamstrings and lower-back erector muscles firing earlier than they should.
Your glutes are supposed to lead the movement; when they don't, the firing order rearranges itself around the muscles picking up the slack.
Test it yourself:
- Lie on your back, one foot flat near your buttock, the other leg extended and raised
- Drive your hips upward, consciously squeezing the glute on the working side first
- Notice where you feel the effort — glute, hamstring, or low back — and whether one side fatigues or cramps faster than the other
For context, a normative study on this exact test found healthy young adults could typically hold a single-leg bridge for around 65 seconds on the dominant leg and 64 seconds on the non-dominant leg, with little difference between sides.
Falling well short of that, or feeling a clear side-to-side imbalance, points toward poor glute recruitment — and lower hold times have also been linked to a higher risk of hamstring injury.
Sign 5 — Referred Pain and Everyday Struggles (Knees, Stairs, Chairs)
Sometimes weak glutes don't announce themselves near the hip at all. Instead, the pain shows up further down the leg:
- The front of the knee (often labeled “runner's knee”)
- The outer knee or thigh, along the IT band
- The shin, as a dull ache along the bone
- Even the heel, in some cases
Alongside that pain, you might notice everyday movements getting harder. Standing up from a chair without pushing off with your hands starts to feel effortful. Going down stairs without a handrail feels less stable than it used to.
Your legs work as a chain, and your glutes are meant to act as shock absorbers at the top of it. Every time your foot hits the ground while walking or running, your glutes are supposed to control how your thigh bone rotates and absorb a good chunk of that impact.
When they're not doing that job, the force doesn't disappear — it travels down the chain, landing on your IT band, your kneecap, your shin, and sometimes your foot instead.
Because your glutes also power hip extension, that same weakness shows up functionally in anything that requires standing up against resistance, whether that's a chair, a set of stairs, or a hill.
Test it yourself:
- Cross your arms over your chest and try standing up from a chair without using momentum or your hands. Struggling to do this smoothly suggests weak hip extensors
- If you run, have someone film you from behind. Watch for your pelvis dropping on one side as that foot hits the ground — this pelvic drop pattern has been identified as the strongest predictor of injury risk in runners
A quick note on “dead butt syndrome”: you may have heard this term, or its clinical name, gluteal amnesia. It's essentially an umbrella for everything above — glutes that have gone weak and under-active from too much sitting, which lengthens them while tightening the hip flexors. Common symptoms include numbness or soreness in the buttocks after sitting for a while, plus pain that spreads to the hips, low back, and knees — tying this sign back to nearly everything covered in this guide.
What to Do If You Recognize These Signs
Don't just run one test and draw conclusions. Set aside a few minutes and go through all four home screens in a single session: the single-leg march, the single-leg squat or step-down, the hands-on-hips posture check, and the single-leg glute bridge.
Add the no-hands chair rise for good measure. Seeing the full picture at once tells you far more than any one test on its own.
As you review your results, keep this in mind: each screen picks up a movement pattern, not a confirmed diagnosis. A single positive result — especially knee valgus, given how mixed the research is on that one — isn't proof of anything by itself.
What matters more is whether signs cluster together, and whether one side of your body consistently underperforms the other. Two or three positive screens pointing the same direction is a much stronger signal than one isolated finding.
If you're pain-free but picked up on a few of these patterns, that's a reasonable point to start addressing them yourself:
- Single-leg work that keeps your pelvis level throughout the movement
- Banded lateral walks to target the hip abductors directly
- Bridges performed by actively squeezing the glute first, before your hamstrings or back can take over
The goal isn't isolating one muscle in a vacuum — it's rebuilding hip stability and control your whole lower body relies on.
Some situations call for more than self-directed exercise. See a physical therapist or physician if:
- Pain persists despite several weeks of consistent strengthening work
- Soreness after activity lasts longer than five to seven days
- You keep dealing with recurrent knee, IT band, or shin injuries
- You have real functional difficulty with stairs, chairs, or balance — particularly relevant for older adults, given the added fall risk
A clinician can run manual muscle testing, analyze your gait, and perform the Trendelenburg test to pinpoint exactly which muscle is underperforming, something a mirror at home can only approximate.
Everything in this guide is meant to help you notice patterns worth paying attention to — it isn't a medical diagnosis. If pain persists, worsens, or comes with numbness or tingling, that's your cue to get evaluated by a qualified professional rather than keep troubleshooting on your own.
Conclusion
Weak glutes rarely announce themselves directly — instead, they show up as a swaying gait, a caving knee, an aching back, overworked hamstrings, or pain that migrates down to your knees and shins.
Spotting one or two of these signs is worth noting, but seeing several together is a stronger signal that your glutes need attention.
Start with the home screens and basic hip-strengthening work, and loop in a physical therapist or physician if pain sticks around or your day-to-day movement keeps taking a hit.
