Originally Posted by Ash_Smith
The LTA doesn't produce a resource like that no. One or two LTA tutors have produce their own resources from their own research (on the serve for u10's for example), but there is nothing central that I am aware of. The RPT do (although it isn't specific for u10's). The ITF I'm not sure, if they do it will be on iCoach I would think, but i've not seen anything like the USTA piece.
Rick Macci wrote an article for tennisplayer.net on the similar subject