What is Flexibility in physical fitness?

Flexibility in physical fitness specifically refers to the range of motion in joints, which is accurately defined by one of the options. This concept is crucial because having a good range of motion allows individuals to perform movements more efficiently and fluidly. Moreover, flexibility plays a significant role in preventing injuries, as greater mobility can help avoid strains and muscular issues during physical activities.

While flexibility does contribute to overall movement efficiency and can help alleviate pain and stiffness, its foundational definition centers on joint motion. Therefore, while the first option makes a valid point about the benefits of flexibility, it does not precisely capture the technical definition, making the understanding of flexibility most aligned with joint range of motion. Other options relate to different aspects of physical fitness, like strength training and endurance, but do not accurately define what flexibility itself is.