Seated Twist (Straight Arm)
Seated Twist (Straight Arm) Exercise Description
The Seated Twist (Straight Arm) is a bodyweight core exercise that builds controlled trunk rotation using a long lever. With the arms extended, the exercise primarily targets the external and internal obliques, while the rectus abdominis and transverse abdominis provide bracing to maintain trunk stiffness; the spinal erectors and hip flexors assist in postural control. The straight‑arm position increases the moment arm, encouraging rotation through the thoracic spine while the pelvis stays quiet and the lumbar spine remains neutral. Keeping the ribcage “down” and the shoulders set (scapular retraction and depression) minimizes compensations such as low‑back flexion or shoulder shrugging. The goal is smooth, symmetrical rotation of the torso as a unit rather than swinging the hands side to side. Performed with a modest hip hinge and a controlled range of motion, it reinforces rotational control and anti‑extension/anti‑lateral‑flexion stability useful for everyday turning tasks. Work within a range you can achieve without losing alignment or letting the knees drift.
- Muscle Groups: Abs, Obliques, Waist
- Target Muscles: External Obliques, Internal Obliques
- Assisting Muscles: Multifidus
- Stabilizing Muscles: Psoas Major, Quadratus Lumborum, Rectus Abdominis, Transversus Abdominis, Trapezius - Lower Fibers
- Body Area: Upper Body
- Body Parts: Core
- Body Surface: Side
- Body Symmetry: Other
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Lateral Flexors, Trunk Rotators
- Joint Involvement: Single-joint
- Muscle Location: Deep Side Abs, Side Abs
- Movement Direction: Rotational
- Muscle Position: Lateral
- Gender: Male
How To Do The Seated Twist (Straight Arm) Exercise
‘- Sit on the floor with knees bent and heels on the ground, tall through the crown of your head on your sit bones.
– Brace the abdomen 360°, ribs down, and maintain a neutral spine.
– Extend both arms straight forward at chest height; elbows straight (not locked), palms together or lightly clasped.
– Set the shoulders by gently retracting and depressing the scapulae.
– Hinge back slightly at the hips until you feel the trunk engage; do not round the lower back.
– Inhale to prepare.
– Exhale as you rotate the torso and straight arms together to one side from the ribcage; eyes may follow the hands. Keep pelvis and knees still.
– Pause briefly, then inhale back to center.
– Repeat to the other side with the same control and range.
– Keep movement smooth—no bouncing or using momentum.
– If you feel low‑back pressure, reduce the lean or the rotation range and re‑brace before continuing.
Seated Twist (Straight Arm) Tips
‘- Sit tall on your sit bones, growing through the crown of your head.
– Brace the abdomen 360° with ribs down to help maintain a neutral spine.
– Keep arms straight at chest height with elbows straight but not locked and palms together or lightly clasped.
– Gently retract and depress the shoulder blades to set the shoulders before rotating.
– Hinge back slightly at the hips until you feel the trunk engage, without rounding the lower back.
– Rotate the torso and straight arms together from the ribcage, keeping the pelvis and knees still.
– Exhale as you rotate to the side; inhale as you return to center.
– Move smoothly without bouncing or using momentum.
– Work only through a rotation range where you can keep alignment and prevent the knees from drifting.
– If you feel low‑back pressure, reduce your backward lean or rotation range and re‑brace before continuing.
Seated Twist (Straight Arm) Beginner Introduction
In the Seated Twist (Straight Arm), the body works against its own weight to challenge rotation control through the midsection. The movement centers on turning the upper body as one solid unit while the arms stay stretched out, creating a longer lever that increases demand on the core. The main workers are the side abs, with the abs, deep abs, back, and hip flexors helping to hold a steady posture. Because the upper back is encouraged to rotate while the hips and lower spine remain steady, the pattern emphasizes controlled motion rather than swinging the arms.
This exercise has a small backward lean from the hips and a smooth, deliberate turning action from side to side. The front of the ribs stays settled, the shoulder blades are gently anchored, and the knees stay quiet, which supports a stable base. The result is a core drill that blends rotation with resistance to arching or side-bending, building torso stability that carries over to everyday tasks involving turning, reaching, or looking over the shoulder.