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  7. Sitting Lumbar Spine Extension

Exercise guide

Sitting Lumbar Spine Extension

  • Intermediate
  • Isolation
  • Rep-based
  • Waist

This isolation exercise targets the erector spinae to improve lower back strength and postural stability while seated. It is particularly effective for counteracting the forward-slumping posture often associated with long periods of sitting.

Reviewed by the Crucible team · Updated June 2026

Watch the Sitting Lumbar Spine Extension demonstrationGuided video and your full workout live in the Crucible app.

Muscles worked

Primary

  • Erector spinae

Secondary

  • Abs
  • Obliques

Equipment

  • Body weight

Setup

  1. Sit upright on the edge of a firm chair or bench with your feet flat on the floor, hip-width apart.
  2. Place your hands across your chest or resting lightly on your thighs.
  3. Engage your core and pull your shoulder blades back to establish a neutral spine.

How to do it

  1. Inhale and slowly hinge forward from the hips, keeping your back perfectly straight until your torso is at a 45-degree angle.
  2. Exhale as you use your lower back muscles to pull your torso back up to the vertical starting position.
  3. Continue the movement slightly past the vertical point into a controlled lumbar extension, arching the lower back gently.
  4. Maintain a slow, controlled tempo of 2 seconds down and 2 seconds up, pausing briefly at the peak contraction.

Form checklist

  • Keep your chest lifted and avoid rounding your shoulders forward.
  • Ensure the movement occurs at the hips and lower back, not by craning the neck.
  • Keep your feet firmly planted to stabilize the pelvis.
  • Avoid using momentum or 'swinging' the torso to complete the reps.

Pro tips

  • Focus on the mind-muscle connection by imagining your spinal extensors shortening as you return to the upright position.
  • Think about 'lengthening' your spine toward the ceiling throughout the entire range of motion to maintain decompression.

Make it harder

  • Place your hands behind your head in a 'prisoner' position to increase the lever arm and resistance on the lower back.
  • Hold a light weight plate or a water bottle against your chest to add external load.

Frequently asked

What muscles does the sitting lumbar spine extension work?
The sitting lumbar spine extension primarily targets the erector spinae, and also works the abs and obliques as secondary muscles.
What equipment do you need for the sitting lumbar spine extension?
The sitting lumbar spine extension requires no equipment — just your body weight.
Is the sitting lumbar spine extension good for beginners?
The sitting lumbar spine extension is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • 45 Degree Twisting HyperextensionIntermediate · erector spinae, glutes, and hamstrings
  • Alternating SupermanBeginner · erector spinae, glutes, and hamstrings
  • Around The World SupermanIntermediate · erector spinae, glutes, hamstrings, and lats
  • Around The World Superman HoldIntermediate · erector spinae, glutes, hamstrings, lats, and trapezius

Train this with a plan, not guesswork

Crucible builds the sitting lumbar spine extension into a precise program around your body, equipment, location, and time.

Download on the App Store