Personally, I think this sentence of the other party, well, is a reply to your concern. It is a bit speculative to say that you can tell whether the other person has a good impression on you through these two words. We've known each other for more than ten days, long-distance love, blind date. To tell the truth, the other person should be just a stranger who has talked for a few days. Especially if the other person has already planned to exercise to lose weight, then if you don't do it, it should have no effect on her actual actions. She will adjust according to her own situation, not your words; But obviously she also felt your simple concern, so she replied to you in a happy tone. Personally, if two people are not familiar with each other, they can get to know each other and comfort each other, but don't interfere with each other's life plans too much, so as not to leave her with a slap in the face and a self-righteous impression. Her reaction is normal. Such a reply and reaction alone is not enough to infer that she intends to develop with you.