If you move more than you are moving now, it is a good thing. The important thing is to increase your activity, either by biking, walking, taking the stairs instead of the escalator, etc.

You could set aside exercise time (say 30 minutes 3-4 times per week to start), and you could start incorporating exercise into your everday activities, like riding your bike or walking to the grocery store.

You have to make it work for your lifestyle, otherwise you won't stick with it. I'm sure others can provide more answers.