Jeff Csatari writes an article for Men’s Health on stretches to do at work to keep your muscles elastic, complete with accompanying photos. When you stay elastic, you breathe deeper, and better lung capacity makes your brain more alert and ready for work. Just 20 seconds of stretches every 20 minutes is enough to help your posture. To do the first exercise, the chest elevation, you do the following:
Sit in a chair with your arms at your sides and your feet flat on the floor. Gently raise your chest toward the ceiling, but don’t look up. Keep your chin level with the floor. Hold this position for 10 seconds, then relax, and repeat 5 to 10 times.
To learn about each exercise with accompanying image, check out the source: http://www.menshealth.com/mhlists/work_stretches/