When we talk about building muscle, we often focus on the "how"—the early morning sessions, the PPL split, and the heavy sets of squats. But all that effort is essentially a demolition crew if you aren’t providing the building materials. In the world of physical transformation, protein isn't just a supplement; it's the non-negotiable foundation. If you want to see a return on your investment in the gym, you have to understand the "why" behind the macros. 1. Muscle Protein Syn