Explain the difference between physical activity and physical fitness.

Physical activity is defined as any bodily movement provided by the contraction of skeletal muscle that increases energy expenditure above a basal level. Physical fitness relates to a set of performance and health-related attributes plus the ability to perform the activity. Performance-related attributes include agility, balance, coordination, power, and speed. Health-related attributes of physical fitness include aerobic fitness, body composition, muscle fitness, and flexibility.