Which type of fitness does not get achieved overnight, similar to physical fitness?

The type of fitness that does not get achieved overnight, similar to physical fitness, relates to the concept of ethical fitness. Ethical fitness refers to the development of one’s moral principles and decision-making abilities in a manner that is consistent and evolved over time. Just as physical fitness requires consistent training, exercise, and commitment, ethical fitness demands continuous reflection, learning, and adherence to a set of values and principles.

Ethics is often cultivated through experiences, education, and personal growth. It involves the ability to discern right from wrong and make decisions that align with one's moral beliefs, which is not something that can be developed quickly. Instead, it is a gradual process that improves through practice, education, and real-life applications, similar to how one builds physical strength or endurance over time.

The other types of fitness mentioned, such as moral and psychological fitness, also require ongoing effort and development; however, the most direct and identifiable parallel to physical fitness in terms of gradual achievement and deep-rooted development is specifically reflected in ethical fitness. Therefore, this makes ethical fitness the most appropriate answer to the question.