Technique:

• Kneel on all fours
• Raise one arm straight upwards
• Rotate your shoulders and middle back looking upwards

Primary muscles: Semispinalis thoracis. Spinalis thoracis. Longissimus thoracis. Iliocostalis thoracis. Iliocostalis lumborum. Multifidus. Rotatores. Intertransversarii. Interspinales.
Secondary muscles: External and internal obliques. Pectoralis major.

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

Note: In order to further stretch your neck, keep your arm pointing straight upwards and look in the direction of your hand.