I'm fortunate to be one of those people who enjoys working out. Even at my fluffiest, I worked out most days, going for walks or jogs, riding my stationary bike, or enjoying the ache of muscles slightly sore from weight training. Still, Lovely Boyfriend and I both have careers that lend themselves to sedentary days. Working from home, we could easily limit our movements to the steps it takes to get to the coffee pot and back.
Recently Connie over at Naked Food Cafe posted the link to an article about a recent study which concluded that being sedentary has more negative effects than simply minimizing calories burned. The bottom line according to this research, is that the enzymes responsible for burning fat quit working when we sit down. They don't kick back in until we get up and moving.
My trusty old treadmill has been rigged to allow me to work without sitting down. With a cheap piece of shelving from the hardware store and a few zip ties, I've set it up so that as I'm typing this, I'm walking at a slow pace on an incline. I don't use this feature as often as I should, and it certainly doesn't replace my focused workouts, but I have to believe every little bit counts.