This is one of the most persistent fitness myths, particularly among women, and the short answer is no, not without a very specific and intentional effort to make it happen. Building significant muscle mass requires years of progressive overload training combined with a substantial caloric surplus, and it does not happen accidentally. What resistance training actually does for most people is create a leaner, more toned appearance by increasing muscle density while reducing body fat, which results in a stronger and more defined physique rather than a bulky one. Strength training is one of the most effective tools available for improving body composition, bone density, metabolic health, and overall functional fitness, and it belongs in almost every person’s program regardless of their goals.