Phil Rosengren is a former pro pitcher and current pitching instructor in the New York/Connecticut area. He is the founder of BetterPitching, LLC and the creator of BetterPitching.com, an online resource for pitchers, parents and coaches.
For the inexperienced pitcher, parent or coach, selecting decent pitching drills can be overwhelming. With such a wide variety available, it's hard to determine what's effective and what's potentially dangerous. [...]