Exercise is important, if you want to lose weight, or maintain a level of fitness it is essential. There are many health problems that stop people from exercising, much of this is related to chronic pain and fatigue, believe me, I know. That does not mean you should give up! Even comatose patients are given range of motion exercises at least one a shift, start off gently, move just to the edge of your comfort zone, and check out this great poster!
Also this video shows a list of five of the most common fitness myths that people have: