I’m always really pleased when someone uses interesting advertising techniques to engage me with a product. Today I got given a free banana on my way into the tube station. Attached to that banana was a sticker with the details of a local gym. I think the idea of associating something healthy with a gym is not at all a bad marketing message. Also by giving the possible consumers value (of a piece of fruit) they are much more likely to take the advertising and be positive to it. The stickers are low-tech and cheap, but the consumer has already taken some value, and is likely to engage anyway.
Another example like this that has been around a while are the Google Map stickers you’ll see in shop windows. Google, obviously, have a list of who is on Google Map. So it wasn’t hard for them to send only those businesses a sticker. And what small business isn’t going put something in their window that says “We’re famous”?