Chest exercises are not only good for perky chests, but also for balancing your body. They improve your posture and ultimately, your overall appearance appears more harmonious. First, a quick fact sheet: The chest muscles essentially consist of three muscles: the pectoralis major, the serratus anterior, and the pectoralis minor. To get a well-defined chest, you should incorporate all three muscles into your training. We'll start with some of the most well-known and effective exercises.