Now Lou does them off the floor. "I don't know what took so long, but I finally made a Zercher harness that allows one to use huge weights and to lift the bar off the floor." Amy Weisberger's best deadlift was  468 after a 21-year career at Westside, but after a 4-month cycle of adding the Zerchers, after squatting a 590 world record she then pulled a 485 personal record and then a 500 deadlift, all this at 41 years old. The only alteration to her training was the addition of the Zercher lfloor, out of the rack, and in a bent-over good morning version.ifts off the floor, out of the rack, and in a bent-over good morning version.