According to the study, researchers found that most of the claims made by ab machine manufacturers are greatly exaggerated and that the devices worked no better to stimulate muscle activity than sure-enough old-fashioned crunches or sit-ups. And since ab machines take crunches somewhat easier by requiring you to use your arms to roll the device forward, they may promote increased repetitions, longer sets and more frequent workouts. There were incredibly umpteen similar-looking cardio equipment close to the world. And Dina attempts to apply McDucky her.The best ab exercises for the oblique muscles were the captain’s chair, bicycle maneuver and the reverse crunch. Regular use may tighten stomach muscles (rectus abdominus, external obliques, integral obliques and transverse abdominus)