Why a physically active job does not guarantee better physical fitness?

A physically active job does not guarantee better physical fitness because the nature of the activities performed may not target all aspects of fitness, such as cardiovascular endurance, strength, flexibility, and balance. Additionally, repetitive tasks can lead to muscle imbalances and overuse injuries, while the physical demands of a job may not provide adequate recovery time. Furthermore, factors like poor nutrition, stress, and lack of motivation can impede overall fitness, regardless of job activity levels.