Dave: Wonderful gym, isn't it?
Jack: Er... yes. It's great.
Dave: This isn't your first time here, is it?
Jack: Actually, it is. You come here often, don't you?
Dave: Yep. At least three times a week.
Jack: You've lost some weight, haven't you?
Dave: Yes. All that fat has become muscle now. If you want to lose weight, too, I recommend using the spin bike.
Jack: OK, but it won't make me too tired, will it?
Dave: Maybe at first, but you'll get used to it. I used to come here every day when I first started.
Jack: Oh, I don't have to come here every day, do I?
Dave: No. Of course not. It's up to you, isn't it?