First of all, get a physical test done to know what damage zero exercise has caused you. This way, you will know exactly what to do. Otherwise, start moving around. Use the staircase instead of the elevator. Instead of using your car, use a bicycle or walk to the local grocery store or the local mall. You can jog every day. If you live nearby your office, instead of using transport, maybe you can simply walk to and fro. You can also start doing some household chores such as washing dishes or washing clothes or dusting. Many people have reduced the work of their maids so that they can do the work instead. Keeping a pet can also help. When you have a dog, you need to take it for a walk every day. It may also require you to play with it in the local park. You can also play with your kids outside. Join some swimming classes if you like water. There are many ways you can increase your physical activity.