Susan, age 39, is a secretary. She spends most of her working day at a desk. Recently she has complained of feeling tired even though she sleeps 7-8...

Susan, age 39, is a secretary. She spends most of her working day at a desk. Recently she has complained of feeling tired even though she sleeps 7–8 hours a night. Her doctor has recommended a walking program to counteract her sedentary lifestyle. She is reluctant to begin. 1. What could you tell Susan about the benefits of regular exercise?