Count me in too. I'm pretty healthy, but I could certainly be more active.
For the last few months, I have been avoiding elevators and escalators whenever possible and it is making a difference. I can out-run the elevator at work
(ok, it's a pretty slow elevator and I don't even have to run)
I have also started yoga classes, which is more physically demanding than I expected. I'm pretty happy about that. The day after the first class, my muscles were so sore I could barely move. But then for the last two weeks, no tired muscles at all. I'll have to complain to the instructor that he's not making me work enough
At home I have also been doing some stretches every morning and I'm also trying to do an exercise we do in yoga that I find extremely difficult. Basically, I lie on my back on the floor, put my hands under my butt, keep my legs straight, with toes pointing towards my head... and I life my legs with my abdominal muscles.
(note: don't try this at home without having instructions first. You could hurt your back if you do it wrong)