I got a pair of these when they first came out and have not worn any other tennis shoes since then! I work in a doctors office and need comfortable shoes since I'm on my feet all day, but the added benefit of toning my legs is great. Yes, they do work too!! It feels like you are walking in sand, so you can tell that you are using those muscles. They do run small so I have to get a half size bigger than I usually wear.  I highly recommend these shoes though!!