Which of the following best defines flexibility in a physical fitness context?

Flexibility in a physical fitness context is defined as the ability to move a joint fluidly through its complete range of movement. This involves the capacity of the muscles, tendons, and connective tissues surrounding the joint to stretch and allow for a broader range of motion. Flexibility is crucial for overall physical performance as it enhances athletic ability, reduces the risk of injury, and can improve posture and balance.

When joints have a greater range of motion, individuals can perform movements more effectively and efficiently, which is essential in a variety of physical activities and sports. Good flexibility plays a significant role in activities like gymnastics, dance, and martial arts, where a wide range of motion is necessary for optimal performance.

The other options focus on different aspects of physical fitness, such as endurance and muscular strength, which do not relate to flexibility.