Chronic bronchitis and emphysema
        
             
        
        
        
Decrease the intenseness of the stepper machine so his heart rate doesn't go over his target heart rate zone.
        
             
        
        
        
Answer:
Explanation:
Listening to music during exercise could lead to a better workout, scientists say. ... Listening to music while exercising can release feel-good chemicals in the brain — such as dopamine and opioids — that may boost your mood, dull pain and make you less tired, scientists say.
 
        
             
        
        
        
Answer:
The average a woman her height gains during pregnancy is 111-149 pounds, which means the most she should weigh is 304 pounds during pregnancy. 
Explanation
 
        
             
        
        
        
They can use scientific journals, presentations during meetings, or just directly towards the public.