Interestingly, the definition of physical fitness has evolved from being focused primarily on athletic performance to include the modern health-related aspects.
The reason for this evolution is because fitness or being fit can be a bit complex or abstract even; hence, the reason for so many different definitions. For instance, government health agencies and other organizations define physical fitness differently even though they do agree on certain aspects.
To get some clarification on the definition, you have to first understand that the definition of fitness is comprised of two separate parts. And including both parts makes the definition more accurate. As a matter of fact, the most accepted definition includes a general or health-related fitness component as well as a specific or performance / skill-related fitness (the ability to perform specific aspects of sports or tasks) component. So a definition falls short when it only uses one part.
Let's elaborate on the two parts of the definition.
Some argument that physical fitness should be measured through the use of some type of criteria (for the health-related components of physical fitness). Health-related or general fitness enterprises those components of fitness that exhibit a relationship with health status as a result of regular exercise, proper diet and nutrition, and proper rest for physical recovery within necessary parameters. In other words, being in a quality state of health and well-being.
On the other hand, some say physical fitness should be measured through a population-based norm defined by specific achievement scores on various fitness tests that represent desired health standards (for the performance / skill-related components of fitness). Performance / skill-related or specific fitness is a person's ability to perform in a specific activity with a reasonable efficiency such as sports
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Therefore, a good general definition of physical fitness is "Good health combined with proper physical development." In other words, a body that is easily able to fight sickness along with a proportionally defined physique. "
However, a better definition might be "A set of attributes that are either health related or performance (or skill) related. components of fitness that enable optimal work or sport performance. "
Now after saying all of that, it needs to be stated that it's not very useful to try and define physical fitness as one, and only one, all-encompassing definition because of the very nature of the concepts involved in defending physical fitness. (And, thoroughly explaining those concepts goes further than the scope of this article.)
On a final note, most government health agencies and exercise scientists, are in fact in agreement that physical fitness can be divided into the following types (known as the 5 components of fitness): body composition, cardiovascular fitness, flexibility, muscular strength, and muscular endurance. Because each of these components can be assessed, quantified and measured to give a general idea of a person's physical fitness level.
Know that some sources may discuss agility, balance, coordination, and speed along with the 5 components of fitness to help clarify the picture of establishing someone's fitness level. In addition, you may also find that some sources include mental and emotional health as an important part of overall fitness.
As you can tell from this article alone, when trying to provide a definition of physical fitness, you can clearly see that complete fitness is certainly more than just good general health.