Don't cross your legs, just sit comfortably as you were.

不要盘腿，就像刚才那样舒服地坐着就可以。

youdao

With a tandem jump you sign a release form, put on a jumpsuit and are quickly shown what to do once you leave the plane: how to cross your arms and bend your legs while in mid-air.

BBC: Falling into New Zealand, from 10,000 feet