Beginner

45-Degree Back Extension

The 45-degree back extension trains hip extension and spinal support together on an angled bench, hitting the erectors, glutes, and hamstrings in one clean movement. It builds lower-back endurance and reinforces the hinge without heavy spinal loading. A versatile accessory you can bias toward glutes or erectors by adjusting posture.

Equipment
Machine
Body part
Glutes, Hamstring
Type
Strength
Browse by movement
Hinge
Muscles worked
Target
Erector Spinae, Gluteus Maximus, Biceps Femoris, Semitendinosus

How to do it

  1. 1

    Set the pad just below your hip crease and hook your heels under the rollers.

  2. 2

    Cross your arms or hold a plate to your chest.

  3. 3

    Hinge forward at the hips with a flat back until your torso points down.

  4. 4

    Squeeze the glutes and hamstrings to raise your torso in line with your legs.

  5. 5

    Stop at a straight body line without arching past it.

  6. 6

    Lower under control and repeat for smooth, full reps.

Tips

  • Round the upper back slightly and tuck the chin to bias the glutes.
  • Do not hyperextend at the top; stopping level protects the spine.
  • Add a plate or hold at the top for tension once bodyweight is easy.

Variations

Common mistakes

  • A pad set above the hip crease blocks the hips from folding, so the movement has to come from the lower back instead; drop the pad until the crease of your hip clears the edge.
  • Momentum takes over as the reps speed up: the torso gets thrown upward and the finish becomes a rebound rather than a squeeze, which is also what carries people past the straight line.
  • The plate is held out at a distance to make the set harder, but that long lever loads the lower back rather than the glutes; keep it flat on the chest and add weight instead.
  • The knees bend to help the torso up, which shortens the lever and quietly hands the rep to the hamstrings; keep the legs straight so the hips do the folding.
  • The ankle rollers sit high on the calves instead of across the back of the ankles, so the shins slide under load and the pressure ends up pinching with every rep.

Frequently asked

How many sets and reps of the 45-degree back extension should a beginner do?
Three sets of 12 to 15 bodyweight reps is a sensible start, since this is endurance work for the lower back as much as strength work. When 15 reps feel smooth, hold a 5 kg plate against your chest before you add reps, or pause two seconds at the straight body line. Twice a week is enough, and it sits well at the end of a session.
What can I do instead of the 45-degree back extension without the machine?
A glute bridge or single-leg glute bridge on the floor trains hip extension with no equipment, and a bird dog builds the same trunk control at low load. If you have a bench and someone to anchor your ankles you can hinge over the end of it, though set that up carefully because the position is only as safe as the anchor. A Romanian deadlift covers the same muscles with a loaded hinge.
What is the 45-degree back extension good for, and when is it a poor choice?
It builds lower-back endurance and hip extension strength with very little compression on the spine, and you can bias it toward the glutes with a rounded upper back or toward the erectors by staying long. That makes it a useful accessory for anyone whose back tires before their legs on squats. It is not a movement for maximal strength, and it is a poor choice while bending forward hurts, since the loaded fold is the whole first half of the rep.

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