Protein is the essential macronutrient for building muscle mass. It plays a critical role in the repair and growth of muscle tissues following exercise, making it a vital component of any fitness regimen that aims to increase strength and muscle size. Consuming adequate protein, particularly in the form of high-quality sources such as lean meats, dairy, legumes, and plant-based proteins, supports muscle recovery and helps maintain an anabolic environment in the body. Athletes and fitness enthusiasts are often recommended to consume protein-rich meals or supplements post-workout to maximize results.