And if it's one step at a time, physical activity is a good place to start. It may, in fact, be the best place to start. In stopping smoking or changing your diet to lose weight, you have to give up something. With physical activity, you take up something. If you do it right, it can be positive and pleasurable from the very beginning.
Many people get active and then decide they'd like to lose weight or stop smoking.
Buoyed by their first success, they simply go ahead and do it. One thing does lead to the next.