Physical fitness is defined as the ability to carry out daily tasks without:

Physical fitness is defined as the ability to carry out daily tasks without undue fatigue. This concept emphasizes that an individual who is physically fit can perform daily activities—such as walking, climbing stairs, or lifting objects—efficiently and effectively without experiencing excessive tiredness or exhaustion.

The focus on "undue fatigue" highlights that physical fitness enables a person to maintain a level of stamina and endurance that allows them to engage in daily routines while reserving enough energy for other activities. This means the body is functioning optimally, and the individual can handle physical demands gracefully without feeling overwhelmed or excessively fatigued.

While options like excess energy, high stress, and physical discomfort may also pertain to overall well-being, they do not specifically encapsulate the core component of physical fitness in relation to daily task performance. The primary point of reference for defining physical fitness is the ability to complete tasks without succumbing to undue fatigue, which can impact overall quality of life and well-being.