How is flexibility defined in fitness?

Flexibility in fitness is defined as the ability to move body parts through a full range of motion. This capability is crucial for overall physical performance, as it affects how well an individual can perform various movements in activities and sports. Adequate flexibility can help prevent injuries, improve posture, and enhance athletic performance by allowing for more efficient movement patterns.

Other options do not capture the essence of flexibility accurately. For example, lifting heavy weights primarily relates to strength, coordination involves the ability to use different body parts effectively together, and endurance pertains to sustaining activity over time, which is separate from the concept of flexibility.