Spine (Lumbar) – Flexion
Spine (Lumbar) – Flexion Exercise Description
Lumbar Flexion is a controlled trunk-curl movement that flexes the lumbar spine against gravity using only body weight. The primary mover is the rectus abdominis, with the external and internal obliques assisting; the spinal erectors lengthen eccentrically as you lower. The goal is to shorten the distance between the rib cage and pelvis through posterior pelvic tilt and segmental spinal flexion, not to perform a hip-dominant sit-up. Range of motion is small and precise: the low back stays anchored while the shoulder blades just clear the floor. This drill builds awareness of spinal positioning and teaches you to initiate trunk movement from the abdominals rather than the hips, performed smoothly in a comfortable, pain-free range.
- Muscle Groups: Abs, Core, Waist
- Target Muscles: Rectus Abdominis
- Assisting Muscles: External Obliques, Internal Obliques
- Stabilizing Muscles: Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core, Torso
- Body Surface: Front
- Body Symmetry: Other
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Flexors
- Joint Involvement: Single-joint
- Muscle Location: Stomach
- Movement Direction: Other
- Muscle Position: Anterior
- Gender: Female
How To Do The Spine (Lumbar) – Flexion Exercise
‘- Lie supine with knees bent, feet flat and hip-width, arms crossed over chest or alongside body.
– Set a neutral head/neck; gently tuck the chin as if holding a small apple under it.
– Pre-tension: exhale gently, draw the ribs toward the pelvis, and lightly brace the abdominal wall.
– Posteriorly tilt the pelvis to flatten the low back into the floor.
– Initiate the curl by shortening the space between sternum and pubic bone; lift head and shoulders together.
– Raise only until the lower scapulae just clear the floor, keeping the low back in contact.
– Keep elbows and shoulders relaxed; avoid pulling on the head or leading with the neck.
– Maintain the posterior pelvic tilt; minimize hip flexion and don’t let the feet push into the floor.
– Pause briefly with steady breath; ribs stay “down,” not flared.
– Lower with control, articulating the spine back to the mat, one segment at a time.
– Move smoothly; stop if you feel pinching, sharp pain, or neck strain.
– Common faults to avoid: yanking the head, holding the breath, thrusting the ribs, and using momentum.
Spine (Lumbar) – Flexion Tips
‘- Before moving, gently exhale and draw the ribs toward the pelvis to pre-tension the abdominals.
– Flatten your low back into the floor with a posterior pelvic tilt before you start curling.
– Initiate the curl by shortening the space between your sternum and pubic bone, not by flexing at the hips.
– Lift your head and shoulders together only until the lower shoulder blades just clear the floor.
– Keep your low back in contact with the floor throughout to maintain the small, precise range of motion.
– Gently tuck your chin as if holding a small apple under it, and avoid pulling on your head.
– Let the elbows and shoulders stay relaxed so the work stays in the abdominals rather than the neck.
– Maintain the posterior pelvic tilt and avoid pushing your feet into the floor as you curl.
– Keep your ribs “down” (not flared) while you pause and breathe steadily at the top.
– Lower with control by articulating the spine back to the mat one segment at a time, avoiding momentum.
Spine (Lumbar) – Flexion Beginner Introduction
Lumbar Flexion is a bodyweight core exercise that emphasizes a gentle curl of the lower spine rather than a big, hip-driven sit-up. Performed lying on the back with the knees bent, the movement centers on drawing the front of the ribs closer to the front of the hips so the abs and side abs take the lead. The upper back and head rise slightly away from the floor, while the lower spine stays grounded and the hips move very little. This small, deliberate motion highlights how the abs initiate trunk movement and how the lower back gradually lengthens as the body returns to the floor.
Because the range is limited and controlled, this drill places attention on body awareness instead of intensity. The emphasis is on smooth, continuous motion, a calm breath, and a relaxed neck and shoulders so tension stays in the mid-section instead of the head or legs. It can serve as a way to explore how the spine curves one segment at a time and how subtle adjustments in rib and pelvis position change the feeling of core engagement.