He said this can increase metabolism but so can any muscle activity. Metabolism increase even while we eat. So, while this statement may be true, it doesn't mean Body Vibes is doing a whole lot. Another expert told Street Cents you can be aware of your abs and tighten them yourself, without the aid of this reminder. The experts Street Cents talked to said this ab machine isn't needed to achieve what the ad claims.
Crunches are just as effective.
So, it could be safe for those with lower back problems. The experts also said that it is possible that all four muscle groups in the abdomen are working while using this machine. But, we don't know to what degree. A certified personal trainer Street Cents talked to said crunches can work all four muscle groups as well - to varying degrees. How to do an effective crunch exercise Experts Street Cents talked to said doing a series of crunches are just as effective as working out on an ab machine.