Place yourself on all four, with your hips above your knees and your shoulders above your hands.

Lift one leg straight up making sure your keep your back straight and your chest does not move forward.

Repeat as prescribed.

Will help:

Shoulder and neck post-op rehab

Frozen shoulder

Rotator cuff injury

Subacromial impingement

Scapular control

Lower back pain

Hip mobility

Thoracic mobility