Flying can be a real trial on the human body--especially those long international flights. Sitting motionless for hours can cause cramps and blood clots. Staring at the seat in front of you can drive you insane with boredom. And plane food, simply, can make you nauseous. However, there are a few things that you can do to keep your body feeling as great as it possibly can.

Dress Comfortably

This is the key to flying in comfort. Unless you are flying out on a business trip and are meeting someone of immense importance at the airport, wear sweats, shorts, or other loose fitting clothes. Primping yourself up or choking yourself with a tie on even a short flight can make it a miserable one. And if need be, you can always change outfits in a restroom once you arrive at your destination.

Move Your Body

Keeping your muscles partially active, especially on those really long flights, is very important--both for your sanity and for your health. When the captain switches off the seat belt sign, get up and walk around the plane for a minute or two. If you have a conservative captain who is weary of turbulence, there are ways to keep your muscles active in your seat. Flex your calves and wiggle your feet back and forth. Stretch your arms by grabbing each elbow and pulling it across your body. If you have room, swing your arms in small circles. All of these will keep you refreshed and will help combat potentially dangerous blood clots that occur when sitting motionless for extended periods of time.

Bring Snacks and Water

Food and refreshments are far and few between on plane flights. Salty foods will calm your stomach if you become nauseous (whether that is a result of turbulence or the questionable food served on planes). Drink water rather than soda. This will keep you hydrated and you will have to use the bathroom less frequently. Light snacks and bottled water, then, are useful tools on long plane flights. I recommend salted nuts, pretzels, and crackers.