Dong-yi's father and brother are members of the Sword Fraternity, which is wrongfully accused of murdering noblemen. She hides her identity and enters the palace as a servant for the Bureau of Music, determined to reveal her family's innocence and find the true orchestrators of the noblemen's deaths.
The curl-up requires use of the abdominal muscles to curl the upper body off the floor. It requires only a partial sit up and hence the hip flexors (iliopsoas is the strongest hip flexor) do not participate in the movement. Research has shown that in a full sit up the hip flexors do most of the work. 1e1e36bf2d