Genetic factors that influence an individual's fitness potential include variations in muscle fiber types, metabolic rate, and responses to training stimuli. Genetic predispositions can dictate how one builds muscle, loses fat, and optimizes aerobic capacity. For example, some individuals may have a higher ratio of fast-twitch muscle fibers, benefiting from explosive activities, while others excel in endurance pursuits. Understanding these genetic influences can aid in tailoring personalized fitness plans that optimize strengths and address weaknesses for better results.