A、It helps improve the physical health. B、It is good for a sound sleep. C、It helps develop mental toughness. D、It helps lose wei

M: Honey, the basketball game is about to start. And could you bring some chips and a bowl of ice cream? And... uh... a slice of pizza from the fridge.
W: Anything else?
M: No, that’s all for now. Hey, honey, you know, they’re organizing a company basketball team, and I’m thinking about joining. What do you think of it?
W: Humph.
M: "Humph"! What do you mean "Humph"? I was the star player in high school.
W: Yeah, twenty-five years ago. Look, I just don’t want you to have a heart attack running up and down the court.
M: So, what are you suggesting? Should I just abandon the idea? I’m not that out of shape.
W:[20]Well, you ought to at least have a physical check before you begin. I mean, it has been at least five years since you played at all.
M: Well, okay, I agree with you.
W: And you need to watch your diet and cut back on the fatty foods, like ice cream. And you should try eating more fresh fruits and vegetables.
M: Yeah, you’re probably right. I should do something to improve my diet.
W: And you should take up a little weight training to strengthen your muscles or perhaps try cycling. Oh, and you need to go to bed early instead of watching TV half the night.
M: Hey, you’re starting to sound like my personal fitness instructor!
W: No, I just love you, and I want you to be around for a long, long time.
19. What does the man want to do?
20. What is the woman’s first suggestion to her husband?
21. Why does the woman suggest the man cycle?