Answer:
genetic factors, long-term physical health conditions, and head injuries or epilepsy.
Explanation:
 
        
             
        
        
        
1 IS A
2 IS D
3 IS A
I DON'T KNOW WHAT 4 IS BUT I HOPE I HELP
        
                    
             
        
        
        
Answer:
Why are muscle and fat levels the only factors influencing flexibility impacted by personal decisions? Age, gender, and joint structure cannot be changed. ... Muscle stiffness that reduces flexibility often results from the overuse of muscle, but inactivity also weakens muscles and can make them more susceptible to injury.