I didn't fully understand this but now I do.... it's fantastic! I see all the other "balance boards" listed on Amazon, and they all wobble, and tilt, and such... So I kept examining the pictures for this item to make sure I wasn't missing something, and nope, I wasn't... it doesn't wobble, or tilt, or have any motion at all, while standing on it. What it does have is "squishy-ness, and that "sinking in" effect, to where if you step around on it, you can really get into balancing effects. I ended up just randomly moving and stepping around, and it was a real delight. It's also great for placing toes on the edge, heels on the floor, and then doing calf raises. In doing those limited few things I can tell there are many other ways to make use of this, it's very versatile. It seems very well made, durable, so it should last forever. A great little physical health and balancing tool that I'm really enjoying and would recommend to anyone looking for such a thing. A real winner.