Stand tall or sit upright (not pictured). Place your left elbow in your right hand.
Reach your left arm overhead, placing palm on the center of your back and supporting the elbow in your right hand. Reach your fingertips down your spine. Keep the shoulders relaxed away from the ears.
Breathe deeply and hold for 10-30 seconds. Repeat on opposite side.
Stretch to the point of "mild discomfort," not to the point of pain. Never bounce.
Muscles Stretched: Triceps