Which definition describes flexibility in terms of physical fitness?

The definition that describes flexibility in terms of physical fitness focuses on the ability of joints to move through their range of motion. Flexibility is crucial for overall physical performance, as it allows for greater movement efficiency and reduces the risk of injury. When joints can move freely within their intended range, this facilitates smoother and more effective movements during various physical activities, enhancing athletic performance and everyday functions.

Flexibility impacts several aspects of fitness, including balance, coordination, and agility. A greater range of motion at the joints can allow for increased athletic skills, such as the ability to perform more complex movements in sports or physical activities. Engaging in regular stretching and flexibility exercises can improve this aspect of fitness, contributing to overall well-being.

In contrast, the other options relate to different components of fitness. The ability to engage in high-intensity sports focuses on cardiovascular endurance and strength, while strength of muscle contractions pertains to muscular strength. The duration of muscular endurance describes the length of time a muscle can sustain a contraction, which is separate from flexibility. Each of these components is important for overall fitness but does not define the concept of flexibility specifically.