I always felt I had to go to a gym and exercise continuously for an hour to get results, and usually ended up doing nothing. Now I exercise in shorter frequent intervals, and find I do more.
When walking down the hall I will stop and do some standing wall push-ups, or do some leg lifts while holding onto the back of the sofa while stopping to watch something on tv. It's endless what you can do. Be creative and JUST MOVE IT!!