She curled her legs up under her.

她盘腿坐着。

《牛津词典》

Dancers have to be very fit because they jump very high and kick their legs up and down.

舞者必须非常健康，因为他们需要跳得很高，并上下踢腿。

youdao

Jump high, bring the legs up, and point the toes forward.

跳高，抬腿，脚趾向前。

youdao

So,during a special time in the game, everyone stands up and stretches their arms and legs.

VOA: special.2011.04.04

You're using a lot of power out of your legs and bringing it up through your torso as you pull through.

VOA: standard.2010.08.03

They say Mutallab suffered severe burns when he tried to use a liquid to ignite powder strapped to his legs and blow up the aircraft.

VOA: standard.2009.12.26

An employee who kicks his legs up on his desk and spends a couple hours flipping through Us Weekly will receive a well-earned reprimand from his boss.

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"Throwing a shoe or hitting someone with a shoe or showing the bottom of your shoe when sitting with legs up on a chair and facing another person all are culturally unacceptable and are considered to be a grave insult and belittling to a person, " Shirazi said.

CNN: Why shoe throwing is 'incredibly offensive'

Rodriguez immediately fell to the ground, laying on his back, his legs curled up above him as he clutched the hand.

WSJ: New York Yankees' Alex Rodriguez Breaks Hand