Early Specialization: Great video on early specialization. Do you know any parents like the ones in the video? The hockey parents are about half way through the video but the whole thing is worth a look.

https://www.youtube.com/watch?v=C6ezBrpaJO0&feature=youtu.be

Study of the Body Checking in Youth Hockey in Canada helps support USA Hockey's change in the age group (14U) when Body Checking is allowed.  It is the coaches responsibility at the 12U age group to teach body checking (both giving and receiving) so the players are prepared at the 14U level.

http://www.cbc.ca/beta/news/canada/calgary/hockey-concussions-down-peewee-bodychecking-ban-1.3697371