One method, called "Chimney Climbing," involves putting one's back and feet on opposite walls and then using the limbs and back muscles to inch upward.
比方說，二片平滑的煙囪狀岩壁間隙，應該用背部和手腳，來頂、撐二面的岩壁，漸次而上。這叫做「煙窗式」。