At some point in your travels, you've probably wondered how you can be so tired; when all you've done is sit on an airplane for three hours. The simple fact is that our bodies are made for movement.

Your lymphatic system is responsible for moving nutrients to various cells, as well as collecting waste products from those same cells. Movement powers the lymphatic system, so if you aren't moving (1) your cells aren't getting the nutrients they need, and (2) the toxic waste they produce is building up.

What with security concerns, crowded flights, and turbulence, getting any movement while you are on board can be quite a challenge. Fortunately, you don't have to run a marathon to get the lymphatic system into gear. A few simple stretches are all that's needed to help you feel as fresh when you walk off the plane as you did walking on.

Put your tray table up and recline your seat all the way. Hold all of the stretches for five long breaths (about 20 seconds). Keep the length of your inhalations the same as your exhalations.

Breathing

• Sit up straight, with both feet flat on the floor.
• Pull your shoulders down and back, hands resting your lap.
• Close your eyes.
• Take 10 deep breaths. Concentrate on keeping your rib cage pulled in and letting air expand into the backs of your lungs.
  

Neck

• Tilt your head to one side, ear to your shoulder; repeat opposite side.
• Tilt your head forward, chin to chest; for a deeper stretch, place a hand on the back of your head, and gently pull your head forward.
• Look straight ahead. Turn your head first to one side, and then the other.