Side Lying Thoracic Open Book
Side Lying Thoracic Open Book Exercise Description
The Side Lying Thoracic Open Book is a controlled thoracic-rotation mobility drill performed on the floor with body weight. With hips and knees flexed to stabilize the pelvis and lumbar spine, the movement emphasizes rotation through the mid‑back while the lower body remains quiet. Opening the top arm guides scapular retraction and horizontal abduction at the shoulder, creating a gentle stretch across the pectoralis major/minor and anterior chest while mobilizing the thoracic spine. The goal is smooth, segmental rotation in the transverse plane with a neutral neck and steady breathing, avoiding lumbar extension or rib flare. This drill also reinforces scapulothoracic coordination—letting the shoulder blade glide toward the spine as the ribcage rotates underneath. Keeping the knees stacked helps limit lumbar motion so rotation occurs where intended; a small pillow under the head or between the knees can assist alignment and comfort. Perform on both sides to address rotation in each direction and maintain symmetrical mobility.
- Muscle Groups: Chest, Pecs
- Target Muscles: Pectoralis Major - Sternal Head
- Assisting Muscles: Pectoralis Minor
- Stabilizing Muscles: External Obliques, Internal Obliques, Multifidus, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Chest
- Body Surface: Front
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Stretching
- Functional Grouping: Horizontal Shoulder Adduction
- Joint Involvement: Multi-joint
- Muscle Location: Mid Chest
- Movement Direction: Rotational
- Muscle Position: Anterior
- Gender: Female
How To Do The Side Lying Thoracic Open Book Exercise
‘- Lie on your side with head supported; stack shoulders and hips. Bend hips and knees to about 90°, knees and ankles together.
– Reach both arms straight forward at shoulder height, palms together, spine neutral.
– Lightly brace the abdominal wall to keep ribs down; keep knees pressed together and in contact with the floor or a pillow.
– Inhale. Exhale as you sweep the top hand across your chest and open the arm toward the floor behind you, rotating through the thoracic spine.
– Let eyes follow the hand; allow the top shoulder blade to glide toward the spine. Keep pelvis and low back quiet.
– Stop at a comfortable end range. Avoid forcing the hand to the floor if knees lift or the low back arches.
– Pause and breathe calmly, maintaining a long neck and broad collarbones.
– Return the arm to the start under control. Switch sides. Adjust range or add support (head/knee pillow) to maintain alignment.
Side Lying Thoracic Open Book Tips
‘- Stack your shoulders and hips with your head supported before you begin.
– Bend your hips and knees to about 90°, keeping knees and ankles together.
– Reach both arms straight forward at shoulder height with palms together and spine neutral.
– Lightly brace your abdominal wall to keep the ribs down.
– Keep your knees pressed together and in contact with the floor or a pillow throughout.
– Exhale as you sweep the top hand across your chest and open the arm toward the floor behind you.
– Let your eyes follow your top hand and allow the top shoulder blade to glide toward your spine.
– Keep your pelvis and low back quiet, avoiding lumbar extension or rib flare.
– Stop at a comfortable end range; do not force the hand to the floor if your knees lift or your low back arches.
– Pause and breathe calmly with a long neck and broad collarbones before returning the arm under control.
Side Lying Thoracic Open Book Beginner Introduction
The Side Lying Thoracic Open Book is a gentle, floor-based mobility drill that targets rotation through the mid-back while the lower body stays anchored. In a relaxed side-lying setup with bent hips and knees, the legs act as a stabilizing base so the movement centers on the upper spine rather than the lower back. The top arm sweeps open in a wide arc, guiding the chest to turn and creating a mild stretch through the front of the chest and shoulder while the mid-back gradually rotates.
As the arm opens, the shoulder blade glides toward the spine, encouraging smoother coordination between the shoulder and ribcage. The neck and head remain comfortably aligned, with calm, steady breathing supporting the motion instead of forcing it. This creates a controlled, segment-by-segment twist through the upper spine rather than a sudden, global turn. Performed on each side, this drill offers a balanced way to explore rotational movement, chest opening, and shoulder motion using only body weight and simple floor support.