This is great, though having trouble with terminology. The video clips are a big help. My DD is 9 and just started pitching this year. I'm working on closing her delivery (if I'm using the proper terminology). She currently pitches straight ahead but she is quite accurate and has a decent velocity. I know this isn't the proper way and she won't improve mush as she moves forward. I look forward to helping her with this I/R approach when travel ball is over so she'll be a new and improved pitcher come next spring.
Thanks for posting this. This site is awesome. I've learned so much and I played modified fast pitch and fast pitch softball for nearly 30 years.