Will,

I know Avery (and his co-author, Pat Mediate) have a financial interest in the videos and books they have published:
www.medballforall.com/books.htm

The medball manufacturer link on their site appears to link directly to www.championsports.com, an independent vendor of discount training equipment.

Most importantly, in my opinion, is that they are evidence based practitioners and researchers who offer rational, developmentally appropriate ideas on training youth. We need that badly because of the incredible noise/nonsense problem we have in the USA.

Regards,