Which of the following best defines flexibility?

Flexibility is defined as the capacity for a joint to move through its full range of motion. This characteristic is crucial for overall physical performance and injury prevention, as it influences the ability to perform daily activities as well as athletic movements effectively. When joints are flexible, they can move more freely and without pain, which facilitates better technique in various physical activities and reduces the risk of strains or sprains.

The other options do not accurately capture the essence of flexibility. Lifting weights pertains more to strength and muscular endurance, rather than the flexibility of joints. Endurance focuses on how long a muscle can perform work without fatigue, and speed of muscle contraction relates to agility and quickness in movement, not the range of motion of joints. Each of these attributes is important in fitness, but they address different components of physical health and performance, while flexibility specifically refers to the range of motion at joints.