My legs swell if I have been sitting at the computer too long. basically the blood goes in and in and less comes back up because of pressure points from the way I am sitting. my doctors advice - stop sitting so long at the computer. LOL legs need exercise to keep the circulation worknig correctly because unlees I am laying down the legs and feet are the lowest point on my body. like water goes downhill so does blood and like water my sitting was acting like a dam blocking the way of the normal waterway. So when I notice my feet start swelling I now spend less time sitting and more time walking and biking in my spare time. not only has my feet swelling been a less of an occance but I am starting to lose the winter weight I gained.