Experts define physical fitness as “a person's ability to perform daily activities with optimal performance, endurance and strength with the control of disease, fatigue and stress and the reduction of sedentary behavior. Fitness refers to the ability of your body's systems to work together efficiently to allow you to be healthy and perform the activities of daily living. Being efficient means performing daily activities with as little effort as possible. A person in good shape is able to perform homework, fulfill household responsibilities, and still have enough energy to enjoy sports and other leisure activities.
A person in good shape can respond effectively to normal life situations, such as raking leaves at home, filling shelves at a part-time job, and marching in the band at school. A person in good shape can also respond to emergency situations, such as running for help or helping a friend in distress.
Personal Fitnessis a continuum of endless possibilities to improve or worsen physical or mental health. Being fit is achieving a level of health and function that YOU can be satisfied with for your current or future goals.
Your personal definition of fitness can change at any time, but you can always be in better shape (improve your health, your physical and mental capacity) to achieve invisible goals, even if you are already fit for what you want. It's possible to be fit in some areas and totally “out of shape” in other parts of your body or life. That said, the study of personal fitness is still considered a physical science, and even if it doesn't use test tubes or microscopes, it does require a certain level of knowledge. Achieving fitness is a personal journey, requiring a deep level of self-acceptance and a willingness to strive to reach new limits.