I had the chance to work with one of my catchers recently and we focused on pop times. Specifically foot work. We took a series of videos before and after and just focused on the difference her footwork could make. While there are a number of factors influencing pop times, (Ball transfer, arm strength, efficiency of using torso and legs, ect...) The goal I had for her was to be able to compare one of her slower throws to one of her faster throws and see just how much her footwork affected her poptimes... This video illustrates this point.
-Chaz @ ACC