Ab Wheel Rollers are among the best home fitness equipment you can get to strengthen and tone your abdominal muscle. It is inexpensive and needs almost no place to store and use.
It is so efficient that even if you only do ab wheel exercises, you will see results. It works not only your entire core, but secondary muscles such as your shoulders, hamstrings, arms and chest.
Check out this article for exercises and variations you can do with the Ab Wheel Roller – http://www.livestrong.com/article/526339-does-the-ab-wheel-work-the-obliques/