I am posting this for my son. He is a sophomore in high school and last year cleared 13' 3" by the end of the season as a freshman. We are just beginning to get back to pole vaulting after a season of basketball (winter) and football (fall). He has quickly hit a wall in his vaulting (11'6"-12'0"). We do not have a high school coach to learn from so we try to learn as much as possible from the internet and have taken a few camps over the past few years.
We went to a college in the area the other day to do some pv work. They graciously allowed us to do a couple short workouts and have a great facility, however, they do not have an official pv coach either.
Could those of you with a better eye and understanding please give us some tips on what you think is happening with his vaults. I know what "I see" (inside or "under" on plant, not swinging to allow hips to get to the pole) but my level of understanding is not that great and I don't know what to tell him or how to explain or describe what might be going wrong. The videos are not in any particular order and please don't listen to the "parent" who is doing the taping.

You Tube video links:
Practice Jump 1: http://www.youtube.com/watch?v=ZdZEL1nX6KY
Practice Jump 2: http://www.youtube.com/watch?v=Y0SnXgMo1eI&feature=related
Practice Jump 3: http://www.youtube.com/watch?v=i3jnhjQ73BQ