When they spell out what the acronym stands for, why wouldn't they spell out the word "for"? Unless this store is for kids who constantly fail all their tests. If that's the case, this sign almost makes sense.
If you choose the stairs over the elevator, it's good for you. You can stay in better shape by giving yourself more exercise. And there's no exercise like falling down for several floors because all the stairs blend together.
Escalators are convenient for when you need to go up or down a flight of stairs, but need to do it quickly. For instance, these three people were in a major rush to reach their final destination, a rock-solid wall. And thanks to the invention of the escalator, they were able to achieve that goal. Thanks, escalators!
If they ever extend these slides to reach the ground, they would probably be amazing. In fact, they're actually pretty amazing as they are. Especially if you like feeling like you can fly...and then breaking your legs.