Do you ever wonder about the beauty secrets of your favorite K-Pop idols?  When it comes in staying fit and sexy, K-Pop girl group SECRET revealed their very own secrets for staying slim.

On the KBS radio program "Lee So Ra's Music Plaza," the SECRET members talked about exercise and dieting.

DJ Lee So Ra started by asking, "Seeing as how SECRET is a girl group, I feel like you would pay special attention to your figures. How do you maintain your figures?"

Sunhwa replied, "When I don't have a schedule, I do aerobic exercises for about an hour and a half on an empty stomach no matter what."

Lee So Ra then asked, "You're so skinny and have no weight to lose, why do you exercise so diligently?" Sunhwa responded, "If I don't do, I don't think I'd be able to eat all day. That's why when I have the time, I always try to exercise."

Hyosung also shared, "I exercise like that only if I've gained weight. I only worry about it and exercise then."

Hana explained her eating schedule by revealing, "I eat what I want as much as I can for one meal and then do not eat any more meals." Ji Eun similarly responded, "When I diet, I decrease the number of meals. I'd either skip breakfast and eat a bit for lunch and dinner or skip breakfast and lunch and eat only dinner."

SECRET recently made their comeback with the track "I'm in Love."