A、Qualified. B、Young. C、Irresponsible. D、Unskillful. A题干询问男士认为私人教练是怎么样的。在对话中男士提到私人教练均毕业于国际私人教练学院，都很有资质。由此可知，私人教练都是合格的，故答案为A)。

M: Is there anything I can do for you?
W: Yes, I think I am a little out of shape now. I want to join a fitness club. And I come over here to ask some information about the courses.
M: OK, madam. Don’t worry. Our club will solve all your problems.
W: This is my first time here. Can you explain your services in detail?
M: No problem. There are three types of membership here, for a period of one month, half a year and a whole year.
W: So what services do you provide?
M: First of all, (23) we’ll design a custom-made work-out plan according to your habits.
W: How can you get that done?
M: Well, we give each of our customers a personal trainer. And he will give you a fitness assessment and then come up with the work-out plan for your needs. Since everyone is different, your personal trainer will find you a suitable type of exercise equipment and teach you all the techniques to help you achieve your fitness level and goal.
W: I don’t quite believe in personal trainers, because some of them are irresponsible and unskillful.
M: Don’t wony. (24) Our personal trainers who graduated from International Personal Trainer Institute are all qualified.
W: Oh, it’s a relief to hear that. And another thing, how can I hold on to it from the beginning to the end?
M: (25) Once you made up your mind, don’t give yourself any excuse for quitting. You must know beauty never comes easily.
W: Yes, that’s right. One more thing, can I reschedule the course when I’m not available?
M: Of course, but only within the effective period.
23. What services does the fitness club provide?
24. What does the man say about personal trainers?
25. How to stick to the exercise courses according to the man?