Which fitness component relates specifically to the flexibility of joints?

The component that relates specifically to the flexibility of joints is flexibility itself. Flexibility refers to the range of motion available at a joint or group of joints, which is a crucial aspect of overall physical fitness. It involves the ability of muscles, tendons, and ligaments to stretch and allow for movement at the joints without restriction. This can help reduce the risk of injury, improve posture, and enhance athletic performance by allowing for a greater range of motion in physical activities.

Other components, such as cardiovascular endurance, muscular strength, and body composition, address different aspects of physical fitness. Cardiovascular endurance focuses on the heart and lungs' ability to supply oxygen during sustained physical activity. Muscular strength pertains to the maximum amount of force a muscle or muscle group can exert against resistance. Body composition refers to the proportion of fat and non-fat mass in the body, which is important for health and fitness but does not directly address flexibility. Therefore, the emphasis on flexibility as a specific fitness component sets it apart from the other options provided.