Know your knots! With this free video tutorial, you'll learn how to tie a simple Prusik knot. The Prusik knot is perfect for mountain climbers, as it tightens when weight is applied and slides when the tensions is released. The knot is easy to tie provided, of course, you know how to go about making it. For an easy-to-follow, step-by-step overview of how to tie this useful fisherman's knot in a minute's time or less, watch this free video knot tyer's guide.