[header] How to tie a swiss seat rappel harness [title] Find the center of the rope by folding it in half and going to the fold. [step] Place the fold in the center of your lower back, ends out to either side of your body so that you're holding an equal length in each hand. [title] Cross the halves in front of you so that it wraps around your waist. 
[step] Pull one side under the other to make a half hitch. Repeat so that the rope turns twice around itself.