Funny you should say that.  My husband's friend a few years back is a gym rat and we had him over for dinner one night.  He looked at me and told me how hot I would be if I started working out.  He said if I joined his gym he'd get me in shape in a month or two.  I looked at him and said, "John,  round  is a shape." 
I waited for him to pick his jaw up off the floor before I burst into laughter.  I never had him over again for dinner, not because he hurt my feelings,  but because I found him incredibly rude.