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?