Which definition best describes "physical activity"?

The definition that best describes "physical activity" is the one that specifies any bodily movement produced by the skeletal muscles that is above daily functioning and results in greater energy expenditure. This definition encompasses a wide range of movements, including structured exercise, recreational activities, and any other movements that go beyond the baseline energy used for everyday tasks.

By highlighting that physical activity is characterized by movements produced by skeletal muscles, it acknowledges both intentional exercise and unintentional activities that elevate energy use, such as gardening, walking, or playing outside. It emphasizes the importance of energy expenditure in distinguishing physical activity from other forms of movement, like sedentary behaviors or involuntary actions.

Other definitions provided are too narrow or incorrect. Casual movements may not necessarily lead to a significant increase in energy expenditure, and limiting physical activity to only sports overlooks the many ways individuals can stay active. Lastly, defining movement with no effort or energy contradicts the fundamental concept of physical activity, which inherently involves exertion. This broader and more precise definition of physical activity allows for a comprehensive understanding that encourages individuals to engage in various forms of movement for health benefits.