45 degree hyperextension (arms in front of chest)
- Target muscle
- Erector Spinae, Gluteus Maximus
- Synergist muscles
- Hamstrings
- Equipment
- Body weight
- Body part
- Back
- Type
- Strength
The 45 degree hyperextension with arms in front of the chest is a bodyweight back exercise that targets the erector spinae along your spine and the gluteus maximus, with the hamstrings assisting the hip extension. Performed on a 45-degree hyperextension bench (Roman chair), it strengthens the posterior chain and builds lower-back endurance for a more resilient back.
How to do the 45 degree hyperextension (arms in front of chest)
- 1Set the thigh pad of a 45-degree hyperextension bench just below your hip crease so you can bend freely at the hips.
- 2Step onto the platform and hook your heels under the foot rollers, keeping your legs straight and your body in a straight line.
- 3Cross your arms in front of your chest and brace your core, keeping your spine neutral from head to hips.
- 4Hinge at the hips and lower your torso toward the floor under control, keeping your back flat rather than rounding.
- 5Lower until you feel a stretch in your hamstrings and glutes, going only as far as you can without rounding your lower back.
- 6Drive through your glutes and erector spinae to raise your torso back up until your body forms a straight line.
- 7Avoid arching past neutral at the top, squeeze your glutes briefly, then repeat for your target reps.
- 8Finish the set, then step off the bench under control.
Form tips
- Keep your spine neutral throughout and move from the hips, not by rounding or hyperextending your lower back.
- Raise only until your body is in a straight line — there is no benefit to cranking past neutral at the top.
- Move slowly and under control in both directions instead of using momentum to swing up.
- Squeeze your glutes at the top of each rep to fully engage the posterior chain.
- Add a light weight plate held to your chest only once you can do clean bodyweight reps with full control.
Common mistakes
- Rounding the lower back as you descend, which shifts load onto the spine and increases injury risk.
- Hyperextending past a straight line at the top, which compresses the lower back instead of working the muscles.
- Using momentum to swing the torso up, which removes tension from the erector spinae and glutes.
- Setting the pad too high above the hip crease, which blocks the hip hinge and forces you to bend through the spine.
- Adding heavy weight too soon, which shortens the range of motion and breaks down form.
Frequently asked questions
What muscles does the 45 degree hyperextension work?
It primarily works the erector spinae along your spine and the gluteus maximus, with the hamstrings assisting as synergists during the hip extension.
Is the 45 degree hyperextension good for beginners?
Yes. It uses only bodyweight and a 45-degree hyperextension bench, so beginners can master the hip hinge and build lower-back endurance before adding any load.
How many sets and reps should I do?
For most lifters, 3 sets of 10–15 controlled reps works well. Prioritize a full range of motion and a glute squeeze at the top over chasing high rep counts.
What is a good alternative to the 45 degree hyperextension?
Back extensions on a horizontal bench, glute-ham raises, and Romanian deadlifts all train the erector spinae, glutes, and hamstrings through hip extension and are solid alternatives.
Where should I feel the 45 degree hyperextension?
You should feel it in your lower back along the erector spinae, your glutes, and your hamstrings — a stretch in the hamstrings at the bottom and a strong contraction as you rise.
