The term "bulked up" generally refers to someone who has increased their muscle mass through strength training, exercise, and proper nutrition. The opposite of this would be "slimmed down" or "lost weight." These antonyms are commonly used in the fitness industry to describe the goals of individuals looking to transform their bodies. While "bulked up" is often associated with male bodybuilders who want to gain muscle size and definition, "slimmed down" or "lost weight" is a popular goal for individuals who want to improve their overall health and well-being and reduce their risk of chronic illnesses such as diabetes and heart disease.