What term is used to describe the body's capability to perform physical tasks?

The term that best describes the body's capability to perform physical tasks is "physical fitness." This concept encompasses various components, such as cardiovascular endurance, muscular strength, flexibility, and body composition. Physical fitness implies an overall ability to engage in activities, whether they are daily tasks or specific athletic endeavors, effectively and efficiently.

While endurance refers specifically to the ability to sustain physical activity over time, agility relates to the ability to move quickly and change direction with ease, and flexibility pertains to the range of motion in the joints. These terms represent distinct aspects of fitness but do not encompass the entirety of what "physical fitness" denotes. Therefore, "physical fitness" is the most comprehensive and accurate choice for describing the overall capability of the body to perform various physical tasks.