Want to get a leg up on healthier airplane travel? It's not a bad idea, given the threat of dangerous blood clots -- also known as deep vein thrombosis (DVT) -- that comes from extended periods of time spent sitting.

The longer you're airborne and the more you fly in short time frames, the greater your risk for DVT. Fortunately, there's something you can do to prevent this serious condition from striking: Exercise.

Exercising right in your airplane seat will keep your blood circulating properly. Northwest Airlines recommends a whole list of exercises -- ankle turns, knee lifts, shoulder circles, knee bends and more -- and you can access them right here. Take a peek, jot them down, and pack them in your carry-on bag. They'll surely come in handy next time you fly the friendly skies.