Often times in slot canyons, you will need to travel up or down the canyon walls instead of just along the ground. Chimneying is the process of pinching yourself between the two walls. Chimneying is achieved by placing your back against one wall and your feet against the other wall. Your body will be facing sideways or up. Your hands are used for balance and for helping you move.
There are two basic movements options while chimneying.
Situations where you would want to chimney.
When compared to walking or stemming, chimneying is slow. You are also limited in the width of canyon that you can chimney. You can't chimney across a canyon that is wider than the distance from your feet to your hips.