You want to keep your kick tight and small with slight knee bend.

你要做到的是双膝微曲的紧张踢腿。

youdao

Gongbu step into tears knee bend, about two feet of horizontal distance to about 30 cm.

搂膝拗步成弓步时，两脚跟的横向距离保持约30厘米左右。

youdao

Then father seriously said to me: "you slide the legs and waist will bend, knee bend forward, the body into a 45 degree Angle with the ground."

这时爸爸严肃的对我说： ：“你滑的时候腿和腰要弯曲，膝盖向前弯曲，身体与地面成45度角。

youdao

It is most unlikely to bend the knee.

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But Mr Khan refused to bend the knee.

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"Bend your left knee!"

WSJ: One Kid's Personal Tennis Academy