Which of the following describes flexibility as a component of fitness?

Flexibility is specifically defined as the ability to move joints through their full range of motion. This component of fitness is essential for overall physical performance and injury prevention. When muscles and joints have greater flexibility, individuals can perform movements with a reduced risk of strain or injury, as well as enhance their functional capacity in daily activities and exercises.

This quality allows for better posture, improved balance, and greater efficiency in movement. Flexibility is often improved through various stretching techniques, yoga, and mobility exercises, which can enhance athletic performance and facilitate recovery post-exercise. The other options focus on different aspects of fitness, such as endurance, strength, and fatigue resistance, which do not pertain to flexibility. Therefore, option B accurately defines what flexibility is within the context of fitness components.