Rock 360 by Ab Trainer (Red) - 360 Degree Abdominal Roller Wheel with Phone Clip Includes 10 DVDs, a knee mat, FREE phone app available on iPhone and Android, phone clip attachment, nutrition guide, design chart and 60-Day Challenge. 360 degree motion works all 29 muscles of the core simultaneously for more defined abdominal muscles. Efficiently and functionally improve your core strength while burning away belly fat with nonstop abs ripping movements. Rolls smoothly on most surfaces.