When you rappel down, you loop the rope over your anchor, your fixed point up top, so in effect, it's secured in the middle of the line.
They point up the poverty of false metaphysics to rid us of the temptation of doing metaphysics this way.
Fold the bottom point up to touch the lowest crease mark (the one that you made in the last step).
Bring the bottom point up to meet the top point, creating a triangle.
Reverse Barbell Curls - Position yourself like you would do the standing barbell curl described earlier, except you place your hands so that your knuckles point up instead.