Yeah, I do that, and I'm a little under 6'. I'm not as bad as I used to be; I only tend to keep my heels a few centimetres off the ground, as opposed to staying as high as I could, like I did when I was younger. I've curbed the habit somewhat by using a pair of heavy boots as my default shoes - you have to make a concerted effort to stand on your toes like that. The idea of my achilles tendons snapping worries me a little, but when you don't even think about doing it, it's difficult to make yourself stop.
