If you believe that the flex belt gives off some kind of electromagnetic pulse meaning that it is not safe for the user then think again because there is nothing harmful about the technology that it relies on. EMS is a stimulation system that directly interacts with the muscles by rapidly vibrating around the waist of the person wearing it and thereby inducing movement in the stomach muscles. These rapid expansions and contractions are what make the flex belt so deadly with regards to its performance in sculpting abs.
The belts are safe from all aspects and this has been further approved by FDA meaning that there is hardly any chance of getting cramps or other related problems. The only question then is just how effective is the belt in creating nice looking sculpted abs and six packs? The answer to that is also given by FDA that suggests using it along with regular training to get flat abs.