Muscular development refers to the process of increasing muscle size, strength, and endurance through various forms of exercise and nutrition. This can be achieved through resistance training, such as weightlifting, which stimulates muscle fibers to grow and adapt. Proper nutrition, including adequate protein intake, is essential for supporting muscle repair and growth. Factors influencing muscular development include genetics, age, and training intensity. Bodybuilders often focus on specific training regimens to enhance muscle definition and size. Additionally, rest and recovery play a crucial role, as muscles need time to heal and grow stronger after workouts.