Answer:
Hereditary
Step-by-step explanation:
Heredity consists of the set of processes related to the transmission of genetic characteristics between individuals, that is, physical and psychic aspects that are transmitted from ancestors (parents) to their descendants (children). There is no way to change heredity as it is something intrinsic to the biological processes of the individual.
During fitness heredity is a factor that cannot be applied or altered. This is because fitness is the term that refers to the resistance that a person has when performing daily exercises. This resistance is not the result of heredity but practice and the specificity of physical activity.