Seated Twist (Straight Arm)
Seated Twist (Straight Arm) Exercise Description
The seated twist (straight arm) is a bodyweight trunk-rotation drill performed upright with the arms extended at shoulder height. It primarily targets the external and internal obliques while the rectus abdominis and transverse abdominis brace the torso; the spinal erectors maintain posture, and the scapular stabilizers help keep the shoulders set. The goal is controlled axial rotation with a stable pelvis—most motion coming from the thoracic spine while the lumbar spine stays neutral. Keeping the arms straight lengthens the lever, increasing the demand on the trunk to resist unwanted side-bending or arching. Expect a small, comfortable range; prioritize tall posture, slow tempo, and smooth breathing over how far you turn. Avoid forcing end range, shrugging, or leaning back.
- Muscle Groups: Abs, Obliques, Waist
- Target Muscles: External Obliques
- Assisting Muscles: Internal Obliques
- Stabilizing Muscles: Longissimus, Rectus Abdominis, Transversus Abdominis, Trapezius - Lower Fibers, Trapezius - Middle Fibers
- Body Area: Upper Body
- Body Parts: Core
- Body Surface: Side
- Body Symmetry: Bilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Lateral Flexors, Trunk Rotators
- Joint Involvement: Single-joint
- Muscle Location: Side Abs
- Movement Direction: Rotational
- Muscle Position: Lateral
- Gender: Female
How To Do The Seated Twist (Straight Arm) Exercise
‘- Sit tall on a bench or sturdy chair with feet flat, knees roughly 90°, ribcage stacked over pelvis.
– Gently brace the abdominal wall; think “tall through the crown of the head.”
– Extend both arms straight in front at shoulder height, palms together or thumbs up; depress and lightly retract the shoulder blades.
– Inhale to prepare. Exhale and rotate the torso as one unit to the right, eyes following the hands; keep hips and knees facing forward.
– Stop when posture would change (arching, slumping, or hip shift). Stay long through the spine.
– Inhale back to center; exhale and rotate left the same way.
– Keep arms straight and level throughout; avoid shrugging, leaning, or bouncing.
– Use a smaller range if the pelvis moves or the shoulders elevate; lower arm height slightly if needed to maintain control.
Seated Twist (Straight Arm) Tips
‘- Sit tall with feet flat and knees roughly 90°, stacking the ribcage directly over the pelvis before you start.
– Gently brace the abdominal wall and think “tall through the crown of the head” to keep the spine long.
– Extend both arms straight in front at shoulder height, palms together or thumbs up, and lightly depress and retract the shoulder blades.
– On each exhale, rotate the torso as one unit, letting your eyes follow your hands while keeping hips and knees facing forward.
– Let most of the motion come from the upper back, keeping the pelvis stable and the lumbar spine neutral.
– Stop rotating as soon as posture would change—arching, slumping, or a hip shifting.
– Keep the arms straight and level throughout, avoiding shrugging, leaning back, or bouncing at the end.
– Use a smaller range of motion if the pelvis starts to move or the shoulders elevate.
– Lower the arm height slightly if needed to maintain control and steady shoulder position.
– Favor a small, comfortable range with tall posture, slow tempo, and smooth breathing instead of forcing more rotation.
Seated Twist (Straight Arm) Beginner Introduction
The seated twist (straight arm) is a simple bodyweight core exercise done from an upright seated position, often on a bench or sturdy chair. With the arms stretched forward and held roughly in line with the shoulders, the body rotates gently from side to side. This setup lengthens the lever of the upper body, so the midsection works harder to handle the turning motion without tipping, arching, or collapsing. The main workload goes to the side abs and abs, while the lower back supports posture and the shoulders help stabilize the arm position.
This movement centers on calm, precise rotation through the upper spine while the hips and lower spine stay relatively quiet. The twisting range is usually modest and comfortable, with an emphasis on feeling tall through the torso and breathing smoothly rather than chasing a big turn. Many people use this drill to explore controlled rotation under light tension, building awareness of how the ribcage can move over a steady base without strain in the lower back or neck.