Answer:
A form of high intensity interval training, CrossFit is a strength and conditioning workout that is made up of functional movement performed at a high intensity level.
Explanation:
 
        
             
        
        
        
What would the answers to choose from be?
        
                    
             
        
        
        
To distribute oxygen and blood
        
                    
             
        
        
        
Answer:
none of the above 
Explanation:
stress affects every part of the human body in some way