I would say mine is in the middle. It's more physically demanding than say working at a desk, but not nearly as demanding as manual labor or something like that. I'm pretty happy with the amount of activity I do at work.I wouldn't want to be sitting all day.
I do massage therapy part time and am doing physical therapy at a clinic for my rotation. I am standing most of the day, and have to demonstrate exercises and occasionally I have to do some lifting to help people to stand up and move weights and equipment around.