If you have spent any time around a squat rack, you have heard it: “Don’t go all the way down — you’ll blow out your back.” It is one of the most repeated warnings in strength training, and it is largely wrong. The research is consistent on this point: depth itself is not what injures lower backs. Technique, your individual hip and ankle mobility, and how you manage load are the factors that actually matter. As a sports chiropractor and former national-level competitive bodybuilder, I have both squatted heavy for decades and treated the lifters who hurt themselves doing it — and the problem is almost never the depth.
The Myth: Deep Squats Destroy Your Back
The fear that deep squats grind down your knees and spine has been passed around gyms for generations. It feels intuitive — more range of motion sounds like more stress on the joints, so going below parallel seems risky by default. That intuition has driven a lot of lifters to cap their squats at a quarter or half depth in the name of “protecting” their backs and knees.
The problem is that when researchers actually measured the loads and tracked the outcomes, the intuition did not hold up.
What the Research Actually Shows
A comprehensive review by Hartmann and colleagues analyzed the loads placed on the knee joint and the vertebral column across squatting depths and weight loads. Their conclusion was direct: deep squats do not increase the risk of injury to the passive tissues — the ligaments, cartilage, and discs — of the knees or the lumbar spine when performed with proper technique and sensible progression. The common fears about degeneration are not supported by the evidence.
There is a counterintuitive twist in the same body of research. To move the same kind of load through a shorter range, partial squats require heavier bar weight, which raises the absolute compressive load on the spine and joints. The review suggests it is the shallow squat under supra-maximal loads — not the deep squat — that may carry the greater long-term cost to the spine and joints over time.
A 2024 scoping review by Rojas-Jaramillo and colleagues looked specifically at deep squats and knee joint structures and reached the same conclusion. Across the studies they synthesized, the large majority found no increased injury risk from the deep squat; only two suggested a possible adverse link, and one of those was a single case report. Their summary judgment was that the deep squat appears to be a safe exercise for knee joint health when proper technique is maintained. The pattern across the literature is clear: depth is being blamed for problems that belong to technique and loading.
So What Actually Hurts Backs Under the Bar?
If depth is not the culprit, what is? For the lower back specifically, the most common mechanical issue is what lifters call “buttwink” — the moment near the bottom of the squat where the pelvis tucks under and the lumbar spine rounds into flexion. Under a loaded bar, that posterior pelvic tilt increases shear and compressive stress on the lumbar discs, and that is where discomfort or injury can come from.
Here is the crucial distinction: buttwink is not caused by depth in the abstract. It is caused by going past the depth your own hips and ankles can support while keeping a neutral spine. Two lifters can squat to the same depth — one with a stable, neutral spine and one collapsing into flexion — because they have different hip structure, different ankle mobility, and different motor control. The fix is almost never “squat less deep forever.” It is finding the specific limiter and addressing it.
Why Depth Is Worth Earning
It would be one thing if shallow squatting cost you nothing. But there is real upside to training through a full range that you give up when fear caps your depth. In a controlled study, Kubo and colleagues compared full squats against half squats with the load equated. Both produced similar growth in the quadriceps — but the full-depth group gained significantly more in the gluteus maximus (roughly 6.7% versus 2.2%) and the adductors. Strength adaptations are also highly range-of-motion specific: training deep builds strength across a broader range and transfers better than training short.
For anyone serious about strength and physique development, that is not a trivial difference. Capping depth out of an unfounded fear leaves measurable glute and adductor development — and usable strength — on the table.
A note on soreness versus injury
One reason deep squats get blamed for “hurting” is that they genuinely produce more delayed-onset muscle soreness than partial squats. The deeper range loads the muscles at longer lengths and involves more total work, so 24 to 48 hours of soreness afterward is normal — especially if the depth or volume is new to you. That soreness is not damage, and it is not a reason to abandon depth. It is a signal to progress sensibly and recover well.
How to Squat Deep Without Hurting Your Back
- Squat to the depth you can hold a neutral spine — not deeper. The goal is the largest range you can own with good position, not a number on a wall chart.
- Build the mobility that earns more depth — ankles, hips, and thoracic spine are the usual limiters behind buttwink. Improving them lets you go deeper safely rather than forcing it.
- Progress load gradually. Most squat-related back complaints trace back to load or volume climbing faster than the tissue is ready for.
- If buttwink or back pain shows up, reduce depth temporarily and address the limiter — do not simply push through it. Pain while squatting is information, not a test of toughness.
Already Hurting From Squatting? Here Is What Actually Fixes It
If a squat session has already left your lower back hurting, the evidence points to a clear path. For acute mechanical low back pain, hands-on manual therapy and spinal manipulation provide meaningful short-term relief (Paige and colleagues, 2017) — but the durable fix is active rehabilitation, not passive treatment alone. The clinical consensus is that manual therapy works best as the thing that calms symptoms enough to let real, supervised strength work do the rest.
That is exactly how we work at Performance Sport Care. We start by diagnosing the actual movement fault driving your pain — the mobility restriction, the loading error, or the motor-control issue behind the buttwink — rather than just treating the sore spot. We use manual therapy to bring the pain down quickly, then move you into supervised strength rehabilitation on site, retraining the squat pattern and rebuilding the capacity that keeps it from coming back. The objective is not to talk you out of squatting. It is to get you back under the bar at full depth.
This integrated approach — led by a clinician who has competed at the national level and spent decades treating strength and barbell athletes in Contra Costa County — is the reason lifters who have tried other care without lasting results often find what they were missing here.
Frequently Asked Questions
Are deep squats bad for your lower back?
No. Comprehensive reviews of the loads on the spine and knees have found that deep squats do not increase injury risk to the discs, ligaments, or cartilage of the lumbar spine when performed with proper technique and sensible progression. Lower back problems from squatting are driven by technique faults such as buttwink, by exceeding your individual mobility, and by load climbing faster than your body is ready for — not by depth itself.
What is buttwink, and is it dangerous?
Buttwink is the tucking of the pelvis and rounding of the lower spine that can happen near the bottom of a squat. Under load, that loss of a neutral spine increases stress on the lumbar discs and is the most common mechanical contributor to squat-related back pain. It is not caused by depth on its own — it happens when you go past the depth your hips and ankles can support with a neutral spine. Because it is usually a mobility or control issue, it is modifiable.
How deep should I squat?
As deep as you can go while keeping a neutral spine and pain-free position — that is the range worth training. Deeper squats offer real advantages for glute and adductor development and for strength across a broader range, so it is worth working on the ankle, hip, and thoracic mobility that lets you reach more depth safely rather than capping yourself short out of fear.
Can Dr. Cancel and Performance Sport Care help with squat-related lower back pain?
Yes. At Performance Sport Care we diagnose the specific movement fault driving your pain, use manual therapy to reduce symptoms in the short term, and then deliver supervised strength rehabilitation on site to retrain the squat pattern and rebuild capacity — the combination shown to work better than passive treatment alone. Led by Dr. Douglas Cancel, a former national-level competitive bodybuilder with decades of sports chiropractic experience, our approach is built specifically for strength and barbell athletes in Contra Costa County who want to return to squatting at full depth, not give it up.
Should I stop squatting if my lower back hurts?
Pain while squatting is information worth acting on, but it rarely means stopping for good. The usual answer is to reduce depth or load temporarily, address the limiter behind the pain, and progress back. If the pain is persistent, worsening, or radiating, that is the point to get an individual evaluation rather than continuing to push through it.
Selected References
- Hartmann H, Wirth K, Klusemann M. Analysis of the load on the knee joint and vertebral column with changes in squatting depth and weight load. Sports Medicine. 2013;43(10):993–1008.
- Kubo K, Ikebukuro T, Yata H. Effects of squat training with different depths on lower limb muscle volumes. European Journal of Applied Physiology. 2019;119(9):1933–1942.
- Rojas‑Jaramillo A, Cuervo‑Arango DA, Quintero JD, et al. Impact of the deep squat on articular knee joint structures, friend or enemy? A scoping review. Frontiers in Sports and Active Living. 2024;6:1477796.
- Paige NM, Miake‑Lye IM, Booth MS, et al. Association of spinal manipulative therapy with clinical benefit and harm for acute low back pain: A systematic review and meta‑analysis. JAMA. 2017;317(14):1451–1460.
This article is educational and not a substitute for personal advice from a licensed health care provider. Exercises or recommendations that are appropriate for one person may not be appropriate for another, particularly if a history of pain or injury exists. If you have persistent or worsening pain, pain that radiates into an extremity, pain that is accompanied by fever, or any other unusual symptoms please consult a qualified provider for an individual evaluation or dial 911 in case of emergency.
