Incidentally I went to a physician thinking I might have a DVT and he said no way and sent me on my way with some steroids to mask the pain. Because I was taking a long flight and hiking in the Rocky Mts I went to a vein specialist the day before who also thought based on my age and excercise routine I couldn't possibly have one it wasn't until I relayed the pain the night before when I felt the Pulmonary Embolism let go that he did a doppler of my leg. After that I literally walked across the parking lot to the ER when it was determined that I had a massive PE. I was in the hospital a short time before my vital signs went ballistic. For all you FTer's that sit for long periods in a seat you should absolutely be thinking this can happen to me! You should all read up on what the sensation of a DVT is too. For me it was a sensation of heavyness and heat in my calf and suddenly it became very painful when I was getting up out of bed. The airlines know the risk and that's why they included the excercises in the in flight mag.