M: Oh, Christina, is that you? How have you been?
W: I've been OK. I've just been busy with school. We really should get together and have a chat. How about joining me for dinner tonight?
M: I'd love to, but I'm leaving for Miami at 8 tonight because my brother is getting married on Saturday morning.
W: Congratulations! I hope that you have a nice time there.
M: Well, what are you doing now? Maybe we can go to the coffee shop and chat for a while.
W: I really wish I could, but I'm on my way to the tennis courts.
M: Tennis courts? I didn't know you could play tennis.
W: I'm taking tennis lessons. My roommate is on a tennis team and she's gotten me interested in the sport. Do you know how to play?
M: A little, but I haven't played for years. When I come back from my trip, I'll join you in taking lessons.
W: It's a deal. Just give me a call when you get back.
M: You got it.

M: If you want to tone your legs, I recommend using the running machine.
W: Thanks. Is there anything that I should pay attention to?
M: Yeah, there are several things. First of all，you'd better start with a low speed.
W: Yeah, I see.
M: Drink some water every 15 minutes. And don't use the running machine more than 4 times a week.
W: OK, thanks.