他在滑雪时双腿分开以保持更好的平衡，在转弯时向后靠在滑雪板上。

It involved skiing with his legs apart for better balance and sitting back on the skis when he came to a turn.

youdao

坐在地板上，尽可能分开双腿，但不要过度拉伸。

Sitting on the floor, spread your legs as far as they will go without overstretching.

《柯林斯英汉双解大词典》