Which of the following is classified as a modifiable risk factor for injuries?

Muscle flexibility is classified as a modifiable risk factor for injuries because individuals can actively work to improve their flexibility through various stretching and exercise routines. Enhancing muscle flexibility can lead to improved range of motion and decreased risk of strains and injuries during physical activity. In contrast, age, anatomical structure, and genetics are factors that cannot be changed or controlled by individuals. They may influence an individual's baseline risk for injuries, but they remain static. By focusing on modifiable factors like muscle flexibility, individuals can take proactive steps in injury prevention and overall physical health.