This is a great thread idea. I swear by keeping active throughout the day. If I drive somewhere, I park as far away as I can from the building, and take stairs wherever I can. Sometimes I will take an extra flight or two of stairs here in my building or just run from the top to the bottom flights and back to my door.
Like others here, I like doing cruches, lunges, and leg lifts during tv shows... I play music sometimes and dance around when I'm doing chores and cooking. I just look for excuses to move and I feel like I'm always in motion... and I think it's all definitely added up and made a difference.