How can I change bad habits to reach a fitness goal?

To achieve a fitness goal, understand why you shouldn't make a change. That's right. Until you grasp why you're sticking like a burr to old habits and routines, it may be hard to muster enough energy and will to take a hard left toward change. Unhealthy behaviors like overeating and smoking have immediate, pleasurable payoffs as well as costs. So when you're considering a change, take time to think it through. You boost your chance of success when the balance of pluses and minuses tips enough to make adopting a new behavior more attractive than standing in place. Engaging in enjoyable aspects of an unhealthy behavior, without the behavior itself, helps too. For example, if you enjoy taking a break while having a smoke, take the break and enjoy it, but find healthier ways to do so. Otherwise, you're working against a headwind and are less likely to experience lasting success.