The quadratus lumborum (QL) is a deep muscle on each side of your lower back that connects your pelvis to your lowest rib and the upper lumbar spine. Strengthening it requires exercises that challenge lateral stability, side bending, and pelvic control. Most people searching for QL-specific work are dealing with lower back pain, a hip hike on one side, or stiffness after long hours of sitting, and the right exercises can address all three.
What the QL Actually Does
The QL runs from the inner lip of your pelvis up to the bottom of your 12th rib and the transverse processes of lumbar vertebrae L1 through L4. Its position makes it a junction point where forces from several surrounding muscles converge. Rather than being a powerful mover on its own, the QL influences how tension transfers between your trunk and pelvis. It contributes to side bending, helps keep your pelvis level when you walk, and plays a supporting role in breathing by acting as a pivot for the diaphragm.
The QL produces relatively small forces compared to larger back muscles. During extension, for example, it generates roughly 10 newtons of force versus the 100 to 150 newtons produced by the erector spinae and multifidus. That means it’s less of a prime mover and more of a stabilizer and force coordinator. This is important for training: you don’t need heavy loads to strengthen it. Controlled, targeted exercises that challenge lateral stability work best.
Why QL Strength Matters for Back Pain
Research measuring tissue stiffness in the QL has found a clear pattern: people with softer, less toned QL muscles report higher pain intensity, greater sensitivity to pain throughout the body, and worse physical quality of life. In contrast, people whose QL maintains healthy stiffness and tone tend to have less pain and better daily function. This doesn’t mean a tight, spasming QL is good. It means a well-conditioned QL with adequate baseline tone acts as a protective factor for the lower back.
The QL also works closely with the gluteus medius, the muscle on the outside of your hip responsible for keeping your pelvis level during single-leg activities like walking, climbing stairs, or running. When the gluteus medius is weak, the QL compensates by working overtime, often becoming overloaded and painful. Effective QL strengthening should include hip stabilizer work as well.
Best Exercises to Strengthen the QL
Side Plank
The side plank is the single best exercise for QL activation because it loads the muscle in its primary role: resisting lateral flexion of the spine. Lie on your side with your elbow directly beneath your shoulder, then lift your hips off the ground so your body forms a straight line. If you’re new to this, start with a modified version from your knees. Hold for 15 to 30 seconds per side and build toward 45 to 60 seconds. Three sets per side, three times per week, is a solid starting point.
To increase the challenge, try lifting your top leg during the hold or stacking your feet on an elevated surface. Both variations increase the demand on the QL and the obliques.
Suitcase Carry
Carry a moderately heavy weight (a dumbbell, kettlebell, or loaded bag) in one hand while walking with tall posture. Your QL on the opposite side has to fire hard to keep your torso from tilting toward the weight. Walk 30 to 40 meters per side, rest, and repeat for three rounds. This exercise trains the QL in a functional, upright position that transfers directly to daily life.
Side-Lying Hip Abduction
This targets the gluteus medius while allowing the QL to co-contract for pelvic stability. Lie on your side with your legs straight, then lift the top leg to about 30 degrees without rolling your hips forward or backward. Clinical trials studying pelvic stability have used three sets of 30 repetitions for hip abduction exercises performed three times per week for four weeks. That high-rep protocol works well for building endurance in these stabilizers.
Side Bend With Resistance
Stand upright holding a dumbbell in one hand. Slowly lower the weight toward your knee by bending laterally, then return to the starting position using the muscles on the opposite side. The QL on the returning side is doing most of the work. Keep the movement controlled, avoid twisting, and use a light to moderate weight. Two to three sets of 12 to 15 repetitions per side works well.
Bird Dog
Start on hands and knees, then extend your right arm forward and left leg back simultaneously. Hold for five seconds, return to start, and switch sides. This trains anti-rotation and anti-extension of the spine, demanding QL engagement on both sides. Three sets of 10 repetitions per side is a good baseline.
Adding Isometric Work for Pain Relief
If you’re dealing with an irritated or painful QL, isometric contractions (where the muscle contracts without moving) are a safe way to build strength without aggravating the area. A well-studied protocol uses gentle isometric holds lasting five seconds followed by a five-second rest, repeated six times per session. Performing this three times per week on alternating days for four weeks produced meaningful improvements in pain and function in clinical trials.
To do this at home, lie on your side and press your hip into the floor or a wall without actually moving. You should feel the QL engage along your lower back on that side. Another option is to stand sideways against a wall, place the back of your forearm against it, and push gently outward. Hold for five seconds, relax for five, and repeat six times. These low-intensity contractions help rebuild tone without the risk that comes from loaded movement during a flare-up.
Training Frequency and Progression
Three sessions per week on alternating days gives the QL adequate stimulus and recovery time. This is the frequency used in most clinical rehabilitation programs and works equally well for people training preventively. Start with the exercises you can do pain-free and add volume or resistance gradually over four to six weeks.
A practical weekly schedule could look like this:
- Session 1: Side plank holds, bird dog, side-lying hip abduction
- Session 2: Suitcase carry, side bend with resistance, side plank holds
- Session 3: Full circuit of all five exercises at moderate intensity
Progression doesn’t always mean more weight. Adding hold time to the side plank, increasing walking distance on suitcase carries, or moving from knee-supported to full side planks are all meaningful progressions that build QL capacity without requiring a gym.
Don’t Forget the Hip
Because the QL and gluteus medius share the job of keeping your pelvis level, strengthening one without the other often fails. A clinical trial comparing gluteus medius strengthening alone versus gluteus medius work combined with QL-specific techniques found that the combined approach was more effective for reducing pain and improving pelvic function. In practical terms, this means your QL program should always include exercises like side-lying hip abduction, clamshells, or banded lateral walks to keep the hip stabilizers working in sync.
If one side of your lower back is consistently tighter or more painful than the other, that’s a sign the QL on that side may be compensating for a weak hip on the same side. Prioritize single-leg balance work and gluteus medius exercises on the weaker side while continuing bilateral QL training.
Stretching and Release Between Sessions
Strengthening alone isn’t enough if your QL is chronically tight. Between training sessions, stretch the muscle by lying on your back, crossing one ankle over the opposite knee, and letting both legs fall to the side of the crossed leg. You should feel a deep stretch along the lower back on the opposite side. Hold for 30 to 60 seconds per side.
Another effective stretch is a standing side bend: raise one arm overhead and lean away from the side you want to stretch, reaching your fingertips as far to the side as comfortable. Placing a foam ball or lacrosse ball against the muscle belly (just above the pelvis and to the side of the spine) while lying on the floor can also help release tension before or after training. Spend one to two minutes per side, shifting your body weight to find tender spots.