A technique that kicks the fly into a pulsing swim toward the top, the Leisenring lift,is generally effective when trout are rising all the way from the bottom to take emergents. A sinking pattern is cast upstream and allowed to drift near the bottom, but when it reaches a likely holding spot it is teased to life, hopefully in front of a trout. It is a method that demands skill in reading water if the angler is not casting to visible fish.