Building muscle mass is hard. It is simplistic in the sense that you simply just got to train hard with progressive overload and a small caloric surplus, but it is a grind. To build muscle mass, you need to make sure you're doing the right things, but also some things that people don't always remember. Though a nice pump is awesome, only chasing it is not optimal to build muscle because it typically means you're not producing enough mechanical tension. ~ Berceste