Pick something up off the floor and your body has a choice: fold at the hips, or fold through the spine. The hip hinge is the first option, done on purpose: the pattern underneath a deadlift, a kettlebell swing, or lifting a laundry basket. Therapists teach it for back pain not because bending the spine is dangerous, but because a good hinge builds the muscles that do most of the lifting.
Hinge, squat, or rounded back?
- Hip hinge: hips travel backwards, knees bend a little, and the trunk tips forward as one piece, like closing a car door with your backside. Hamstrings and glutes do most of the work.
- Squat: hips drop down rather than back, knees bend a lot, and the trunk stays upright. The thighs lead.
- Rounded back: hips and knees stay still and the spine curls forward. Quick, and not forbidden, but it asks little of the hips and legs.
The dowel drill: three points of contact
Hold a broomstick along your back, one hand behind your neck and the other behind your lower back, so it touches the back of your head, your upper back, and your tailbone. Push your hips backwards, let the knees soften, and tip forward until you feel a stretch in the back of your thighs. If all three points stay in contact, you are hinging. If the stick lifts off your tailbone, your lower back is rounding; if it leaves your head, you are curling your upper back. Stand up by driving the hips forward, not by pulling the chest up.
Which muscles do the work
A hinge is hip extension, so the glutes and hamstrings drive it while the back extensors hold the trunk steady. A 2021 study in the Journal of Sports Science and Medicine tested this in 15 resistance-trained women: the Romanian deadlift activated the gluteus maximus 94 to 140 percent more than a seated back extension machine and the hamstrings 61 percent more, while the lower back muscles worked to a similar degree in both.
What research says about lifting technique and back pain
The honest answer is less tidy than "lift with your legs, not your back" suggests. A 2020 systematic review in the Journal of Orthopaedic and Sports Physical Therapy pooled 11 studies and found no evidence that lifting with a more flexed lumbar spine was a risk factor for developing or keeping low back pain, though the evidence was rated low quality. A 2022 Cochrane review of nine randomised trials with over 20,000 workers found, with moderate-quality evidence, that teaching lifting technique did not reduce back pain or back-related disability.
So why teach the hinge? Not to avoid bending, but to give you a strong option for lifting, and a sore back a movement it can trust while it settles. Technique alone does not prevent back pain; capacity and gradual exposure matter more.
From bodyweight to kettlebell
- Dowel hinge: 2 to 3 sets of 8 to 10 slow repetitions until the three points stay put without effort.
- Hands-free hinge, then a hinge to a chair behind you so the knees cannot take over.
- Kettlebell Romanian deadlift: a light bell in both hands, kept close to the legs, lowered to about knee height or wherever your hamstrings say stop. Load and depth go up only when the pattern is clean and your therapist agrees.
Common mistakes
- Squatting instead of hinging: knees shoot forward and the hips drop rather than travel back.
- Rounding the lower back near the bottom, usually because the range is too big for your hamstrings.
- Letting the weight drift away from the legs, which makes the back work harder.
Practising the hinge in a guided session
The hard part of the hinge is that you cannot see your own back. In a KineTrue session the camera tracks your trunk and hip angles, so you get feedback on whether the hips are travelling back and the trunk is moving as one piece, and your therapist can review recorded sessions before adding load.
If your plan also includes hip strengthening from the floor, see our guide to the glute bridge
Sharp back pain, pain spreading down a leg, numbness, or symptoms clearly worse the next day are reasons to stop and check with your physical therapist before continuing or adding weight.