I learned from Richard teacherman1986 and he said he was duplicating Barry Bonds swing. In the beginning, some of my students developed a very steep bat angle that would eventually need to be addressed. Barry also said , he chopped down on the ball and a few others said the same thing but it looks different on their live swing. Haley’s swing had a big loop in it and I thought the Bonds drill would help her. Richard described the chopping down motion that hitters feel changes when done one legged or two . Haley’s swings on the tee you can see the difference between weight being on one leg or two.