Do these things actually work? A friend gave me one and I have been hesitant to use it. The reason I ask is because my stomach is really the only place that bothers me. He says that this thing will tone my stomach up really quick if used correctly.
If anyone has any experience using one let me know something about technique or anything else I might need to know.
If anyone has any experience using one let me know something about technique or anything else I might need to know.