_______ is planned, structured, repetitive, and purposive to maintain or improve physical fitness.

The answer is exercise because it encompasses activities that are planned and structured specifically to enhance physical fitness. Exercise involves repeated movements that are deliberately designed to improve various aspects of health, such as cardiovascular endurance, muscular strength, flexibility, and overall wellness. This intentionality and purposefulness distinguish exercise from other forms of physical activity.

In contrast, lifestyle activities refer to everyday movements that may contribute to overall health but are not specifically designed for fitness improvement. Inactivity represents a lack of movement, which does not contribute positively to physical fitness. Obesity is a condition often resulting from an imbalance between energy intake and expenditure, and it is not a form of physical activity. Thus, the focus on intentionality and structure in exercise makes it the correct answer in this context.