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What Muscles Work In A Hip Thrust, And Why The Glutes Get The Job Without The Back Doing It For Them
From the FASTER syllabus: this article is taught in full in The honest route from scratch to qualified →
In short: A hip thrust is a glute exercise, and the four steps show why. The load acts straight down through the hips, so the muscle working directly against it is the gluteus maximus, which is stretched at the bottom and shortens to finish the movement. The hamstrings and the adductor magnus assist the hip extension, the quads hold the knee where it was set, and the trunk muscles keep the ribs stacked over the pelvis so the movement stays at the hip and does not turn into a lean back through the spine. The four steps that produce that answer are: decide where the force is acting, find the muscles working directly against it (the ones lengthening are easiest to see), find the secondary muscles assisting, then find the muscles supporting the joint. The same four steps have already answered the same question about a squat, a lunge, a deadlift, a press-up, a row, a shoulder press, a loaded carry, a suspended plank, a sprint, a medicine ball throw, a vertical jump, a kettlebell swing, a band wood chop, a bird dog, a single-leg overhead reach, a hip hinge, a lateral lunge, a lateral shuffle, a split squat, a single-leg deadlift, a bear crawl, a beast position, a walking lunge, a high kick, a Romanian deadlift, a single-arm overhead squat, a step-up and a mountain climber.
What muscles work in a hip thrust
The gluteus maximus does the main work in a hip thrust. The hamstrings and the adductor magnus help it extend the hip, the quads hold the knee angle steady, and the trunk muscles keep the ribs stacked over the pelvis so the movement stays at the hip. The four steps below are how that answer comes out, and they work the same way on any exercise.
Where a career-changer meets this one
Somebody weighing up a move into personal training will have seen the hip thrust everywhere, and may well have wondered whether they would be able to explain it to a client with a straight face. One of the things you learn on our CIMSPA-recognised personal training course is a short method for exactly that. It turns "which muscles is that" into something worked out in front of the client, and the hip thrust is a friendly first test, because the answer is nearly as tidy as the exercise looks.
Twenty-nine exercises in, and the method still hasn't changed
A squat, a lunge, a deadlift, a press-up, a row, a shoulder press, a loaded carry, a suspended plank, a hip hinge, a Romanian deadlift, a step-up, a mountain climber and the rest of the list have all run through the same four steps:
- Decide where the force is acting on the body
- Identify which muscles work directly against that force (muscles that lengthen are easiest to see)
- Identify which secondary muscles assist that movement
- Identify which muscles would support that joint / movement
Run it on a hip thrust.
One, where is the force acting? Straight down through the hips. With the upper back resting on a bench and the feet planted, whatever sits across the hips (a bar, a dumbbell, plain bodyweight) is pulled towards the floor, and the hips have to rise against it.
Two, what works directly against it? The gluteus maximus. It is the muscle that extends the hip, and it is easiest to see at the bottom, where it is lengthened under the load, then shortening as the hips rise to the top.
Three, what assists? The hamstrings, which also extend the hip, and the adductor magnus, whose back part joins in on the same job. Both take a share of the work, and neither replaces the glutes.
Four, what supports? The quads, holding the knee at the angle it was set at so the shins stay put while the hips travel. The trunk muscles work alongside them, keeping the ribs stacked over the pelvis at the top, so the movement stays a hip movement and the range does not come from arching the lower back.
Why the eye lands on the wrong place
A hip thrust looks like the back is lifting the hips, because the whole body is bending at the middle and the back is what is in view. Run the method and the back turns out to be the passenger. A client who feels a hip thrust "in the back" has usually found a way to borrow range from the spine, and the useful coaching is about the ribs and the pelvis, which the four steps point straight at.
Point it at anything
The same answer, hip extension against a downward load with the trunk holding still, covers a glute bridge, a single-leg bridge and a cable pull-through. Once a trainer can say what is working on a hip thrust, those come with it, with no new list to learn.
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Also worth a look: Level 3 Personal Trainer, the anatomy unit this comes from.
See what the course covers →Frequently asked
Is a hip thrust only a glute exercise?
The glutes are the main event, but the hamstrings and the adductor magnus help extend the hip, and the quads and the trunk work to hold the position while it happens.
Why does the trunk matter in a hip thrust?
Its job is to keep the ribs stacked over the pelvis, so the movement stays at the hip. When the trunk lets go, the range comes from arching the lower back instead.
Does finishing the course get me PT Manager?
Yes. PT Manager opens the moment you sign up with FASTER, and adding real clients unlocks once you pass a course.
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