45 degrees Back Extension
- Target muscle
- Erector Spinae
- Equipment
- Body weight
- Body part
- Hips
- Type
- Strength
The 45 degrees back extension is a bodyweight exercise that strengthens the lower-back muscles (erector spinae) by extending your torso against gravity on an angled hyperextension bench. Set at roughly 45°, it builds spinal endurance and a stronger posterior chain through the hips, making it a popular accessory for lifters and a safe entry point for low-back training.
How to do the 45 degrees Back Extension
- 1Set the foot platform of the 45° bench so the top pad sits just below your hip crease, leaving your torso free to bend forward.
- 2Climb on and anchor your heels under the foot pads, keeping your legs straight and your body in one straight line.
- 3Cross your arms over your chest or place your hands lightly behind your head, and brace your core.
- 4Hinge forward at the hips with a flat back, lowering your torso toward the floor under control until you feel a stretch in your hamstrings and lower back.
- 5Drive your hips into the pad and extend your torso back up by contracting your erector spinae.
- 6Stop when your body forms a straight line from heels to head, without arching past neutral.
- 7Pause briefly at the top, then lower under control for the next rep.
- 8After your final rep, step off the bench carefully.
Form tips
- Move slowly and lead the rise with your hips and lower back, not by jerking your upper body.
- Keep your spine neutral throughout — a flat back going down and a straight line at the top.
- Exhale as you extend up and inhale as you lower to keep your core braced.
- To progress, hold the top position for a one to two second squeeze before adding any load.
Common mistakes
- Hyperextending and arching past a straight line at the top, which compresses the spine and risks lower-back strain.
- Using momentum to swing the torso up, which removes tension from the erector spinae and reduces the benefit.
- Setting the pad too high above the hips, which blocks the hip hinge and shifts strain into the lower spine.
- Yanking on the back of your head with your hands, which pulls the neck out of alignment.
Frequently asked questions
What muscles does the 45 degrees back extension work?
It primarily targets the erector spinae, the muscles running along your lower spine, and works the hips as you hinge and extend your torso.
Is the 45 degrees back extension good for beginners?
Yes. As a bodyweight movement it lets beginners build lower-back strength and endurance safely, as long as you keep a neutral spine and avoid arching past a straight line.
How many sets and reps should I do?
For most lifters, 2 to 4 sets of 10 to 15 controlled reps work well. Because the lower back responds to endurance, higher reps with strict form are usually more effective than heavy loading.
Should I go past parallel at the top?
No. Stop when your body forms a straight line from heels to head. Arching beyond neutral compresses the lower spine and adds risk without extra benefit.
