I have one big one that you are supposed to put equipment on and a smaller one to go on my step. The big one does not move and is great for abs and stretch routines and you have room to move around without going off your mat.
Got a 2 pack of yoga mats, very thick, sturdy, comfortable from Costco online. Great price too. As good as other mats I've had in the past that were way more expensive.
Have also had Gaiam brand mats before. They were good too, but pricey