Like anything else, weight training has its dos and don'ts, and if you want to change your physique, you should pay attention to them. Basic training principles have been established to help lifters of all levels optimize their workouts. Even so, a lot of people work out without fully understanding what these principles are and how they can be used to their fullest advantage. If all lifters (and yes, if you pick up a weight, you are a weight lifter) were to apply these simple guidelines to their training, they'd soon see radical improvements.