What most of the lifters want? Bigger pecs.That is the reason why many people in the gym working on their pecs on Monday, and chest day usually leads off the training week. In every gym across the world, Monday is known as the Chest Day on lifters' calendar.  What you need to know for building any muscle? Strength is the best shortcut for size. Focus more on doing barbell and dumbbell workouts and lift heavy weights. For more about building muscle mass read another article on this website: The guide for building muscle mass You will need to know some basic principles for building muscle mass in order to build the bigger chest. Also, it is very important not to work on your ego more than you work on your chest. You need to lift heavy weights but don't lift heavy weights with a bad form, that won't get you bigger chest, and you can also get yourself an injury. Focus on lifting with a rep range 8 - 12 and from 75% to 85% 1RM (Rep Maximum). ...