LPF is a defensive training tool for all positions on the baseball field. We recommend that it is used as much as possible to create the muscle memory needed to be consistent defensively. It can be used without a glove as well so that it can be more effective at home to do all the drill work to create that muscle memory in your glove and body posture. The LPF is the adult size training device that is recommended for 14-year olds and up.