Technique:

• Sit on a chair with your feet flat on the ground
• Keep your body upright and look straight ahead
• Slowly bend to one side
• Reach towards the ground with one hand
• Avoid bending forward

Primary muscles: Quadratus lumborum. External and internal obliques.
Secondary muscles: Iliocostalis lumborum. Intertransversarii. Rotatores. Multifidus.

Injury where stretch may be useful: Back muscle strain. Back ligament sprain. Abdominal muscle strain (obliques).

Note: Make sure to use a strong and sturdy chair. Avoid leaning forward or backward during the stretch and concentrate on keeping your upper body straight.