Stand tall or sit upright (not pictured). Interlace your fingers behind your back and straighten you arms.
With arms straight, lift arms up behind you while keeping your back straight and your shoulders down. Keep the shoulders relaxed away from the ears.
Breathe deeply and hold for 10-30 seconds.
Stretch to the point of "mild discomfort," not to the point of pain. Never bounce. Straighten but do not lock elbow.
Muscles Stretched: Chest, shoulders, biceps