One easy way to get more exercise is to always use the stairs. Going up and down stairs is great exercise - It'll burn plenty of calories.

If you are in a department store and can't find any stairs, but there is a moving staircase, just climp up and down it as it's moving. But if you are offered a choice between stairs and an escalator, stairs are the choice for those who wish to lose weight or keep it off.

If you are lucky enough to live in a house with stairs, make sure that you go up and down them as often as possible. Try to set up your life so that exercise is built in.
Say you have your computer upstairs, but the coffee maker downstairs, every time you want a cup of coffee you'll get some exercise. Those little bits of exercise add up over the day.