My coach advised that an abs wheel was one of the most effective ways to train the core. This wheel feels sturdy and the foam coverings on the handles make it comfortable to hold - though perhaps a wipe clean, rubberised surface might have been a bit more hygienic. As for negatives - the packaging is rather 1980s, there was a small element of self-assembly required and there aren't any instructions on use included in the box. However, overall this abs wheel is good value for money and I'm sure it will be a great addition to my training tools.