The best possible work-out for an indoor cat is scratching. It allows cats to stretch and tone their muscles and is great exercise for couch potato kitties. Inclined to Scratch can be placed on the floor for horizontal scratching or it can be positioned at a 45° angle against the wall for kitties who prefer to scratch vertically. A pinch of catnip rubbed on the scratcher and kitty is in training.
Inclined to Scratch Ramp - Cat Scratcher The very day I received this I was putting it up against the wall and the little sticky things on the back that are supposed to hold it steady fell right off. It now sits on the floor, where it moves every time my cats try to use it. I would definitely not recommend it.
Bought these to put against a new chair to prevent my cats from scratching it. They do work, and the cats do use them, but they're pretty ugly, as the box you see in the photo does not come off. Well, it CAN, but then you can't lean them at the 45-degree angle. They're made of cardboard, so the price seems a little high for what they actually are. In short, they're effective, but they do not complement my living room decor at all.