Another easy and useful side stretch can be done standing up. Start with legs about hip distance apart. Inhale to raise both arms overhead. Interlace your fingers and turn your palms around to face upward. Exhale to bend toward one side, inhale to stand straight, and exhale to bend to the other side.
These stretched can also be done in a chair:
Integrate side stretching into your morning routine and during breaks throughout the day. Enjoy letting the ribcage out for a breath of fresh air.