The goal of any training aid
is to make a skill easy to perform.
The series above shows how effortlessly a swing can be when it has been mastered. These swings while looking very easy are the consequence of unlimited, focused practice. The hitter in the clips started using the Hitting Coach in High School and used it throughout his professional baseball career. He hit well over .300 when he played in the Big Leagues. (All the split second essentials necessary to be a good hitter i.e. quick hands, timing, eye-handed coordination, leg and hip action et al are evident is these swings.)