How is physical fitness best defined?

Physical fitness is best defined as a set of measurable physiological parameters because it encompasses a variety of components that contribute to overall health and performance. These components include cardiovascular endurance, muscular strength, muscular endurance, flexibility, and body composition. Each of these aspects can be assessed through specific tests and metrics, painting a comprehensive picture of an individual's fitness level.

By using a range of physiological parameters, this definition acknowledges the multi-dimensional nature of physical fitness, rather than reducing it to a single score or a narrow focus on one aspect, such as cardiovascular health. This broader perspective is essential for understanding and improving overall well-being and performance in various physical activities.