A physically fit person is best defined as someone who a physically fit person is best defined as someone who has ideal body composition, flexibility, lung capacity, and muscular fitness levels. is a highly skilled athlete. performs moderate to vigorous physical activity daily without undue fatigue. has optimal wellness in all dimensions.

A physically fit person can be defined as the one who is capable of moderate to vigorous daily physical activity without feeling fatigued. Regular exercise builds the stamina of a person which is an essential component of the physical health. Being capable of performing daily tasks with ease is the characteristic of a physicaly fir person.

Hence, the answer is 'performs moderate to vigorous physical activity daily without undue fatigue'.