A little rough on the knees.
I used this "Sunny health and fitness ab roller slide" at my mothers house a couple of times. I have been trying to tone up my body and lose some weight. After having kids it almost seems impossible. With this ab roller slide there are a couple things to keep in mind. One thing you have to remember is that it takes some time. You have to keep using this product consistently for it to work. You also have to eat healthy and keep up on exercise. My personal experience with this product is mediocre. I am still undecided about how I like it. It is a bit rough on the knees and back. You may have to put a pillow under your legs for comfort. As for people with a bad back, I would not recommend this ab roller slide. This product puts a heavy amount of pressure on your lower back. What I really like about this ab roller is that after using it you will feel the burn in your abs so you can actually feel it working! And I must say it is a much better alternative that the normal floor crunches.
TiffanyWilkins
USA