Girl Group AOA Seol Hyun, Choa, and Jimin revealed their ways of maintaining a weight in the 40's kg.

On the tvN Chung Dam Dong 111, Seol Hyun, who worried about having a weight over 50 kg made a comeback with a perfect skinny body. FNC Entertainment said the secret was a protein diet and working out.

Choa said her secret was working out in between times. She said she does sit-ups in stand by rooms when she has time.

Leader Jimin, who recently lost 5 kg, said her secret was working out and eating only once a day. She recently revealed that she is trying to maintain her 41 kg weight for their new song, 'Short Hair.'

AOA's Short Hair is gaining a lot of popularity in Korea as well as China.