Jung Dayeon

The woman who kick-started the "momjjang" (hot body) fad in Korea, Jung Da-yeon.
This young lady transformed herself through exercise, and is known as an expert on physical training and exercise now.
She has released a popular fitness book, a DVD called "Momjjang Diet" and even been in a K-drama (in Korea) called "Aquarius".
Jung played a fitness instructor.
She has her own website, http://jungdayeon.com/ that is in Korean and Japanese.

And here are some clips from her TV show FIGUREROBICS from YouTube:

Mi-Hee Yu, Another Look

Here's another look at former aerobics instructor Korean female bodybuilder Mi-Hee Yu.
She says that her weight had gotten up to 176 after the birth of her daughter and she wanted to lose weight so she took up bodybuilding.
All of this muscle is packed onto a 5' 2½", 112-pound frame by the way.
And she's an all natural bodybuilder.