Keep this stretch in mind when you find yourself sitting for long periods of time. It will help to relieve tension and tightness in your upper chest and back, as well as make it easier to stay mentally clear and focused.
Sit near the front end of a sturdy chair. Place your feet and knees together, with feet flat on the floor. Reach your arms behind you and grasp the back of the arm rests or the chair back. Hold on firmly as you inhale and lift your chest. Hold this position for a few breaths as you focus on feeling a deep stretch across your chest and shoulders.