I love my balance stuff! Target has their balance board things on clearance (at least at mine.) 30% off I think. I also have 2 of the xerdiscs and enjoy those, and a BOSU (love that thing) and a Reebok core board that I got used on ebay. You can do so much with all of it. I will use any of these (except the balance board - don't have that but I guess it's the thing that is round with a ball like thing under it? That is what Target has on clearance anyway). You can use the others for lunges, yes, squats, deadlifts - anything that makes you engage your muscles on a wobbly surface but always go lighter in weight than you normally would. You can do great ab work on these, push up work too. The BOSU was the most expensive thing for me. You might want to check out the Reebok core board - they don't make them anymore but you can do so much with them, and you can adjust the amount of wobble too.