How to Tie a Double Fisherman Back Up Slip Knot for Rock Climbing

"Hi! My name is Brandon. I'm with expertvillage.com, and today I”m going to show you how to rock climb. The final step to tying yourself in would be to tie a backup knot. To do this with the remaining rope you have leftover, wrap that rope one time around the rope going up to the wall. Now you have one full loop. Next step, take the remaining rope, wrap a second loop under the first one you've created. The very end of the rope then gets passed through both loops and pull that tight. The knot you've just tied is called a double fisherman knot. The purpose of this knot is to protect you in case your figure 8 will come undone. This is a slipknot, so in case your figure 8 does come untied, it's going to slide down around your harness tying point, preventing you from falling."