Rainbow revealed the benefits of the ab dance from their newest track 'A'.

During the performance, the seven girls slightly lift their shirts and show off their stomachs, so it has been titled the ab dance by their fans. Rainbow said, "We went on an intense diet because of the ab dance. Hyun Young lost 13lbs (6kg) through exercising and eating a healthy diet." They ate things like sweet potatoes, pumpkins, chicken breasts, and cherry tomatoes. Yoon Hye said, "We don't get sick of it. Everyday we cook it a different way, whether it be steaming it, roasting it, grilling it, or boiling it. We are still on a diet, but we love eating so we do eat regular meals too."