I have tried to improve the video, this time included my action as well (last three) just to contrast what my son is doing different as well as to show him the arm/wrist at the moment of delivery.
I will reserve my comments until you have seen the videos.
http://www.youtube.com/watch?v=ChYHivKP8sA - from back
http://www.youtube.com/watch?v=YuFeuk9Z4NY - arm
http://www.youtube.com/watch?v=r4TJ_RRN_vQ- from front
http://www.youtube.com/watch?v=f0yAtRwasBM - tcs from back
http://www.youtube.com/watch?v=b5kwwVFZN40 - tcs arm
http://www.youtube.com/watch?v=NG3oVzOFd_E - tcs from front
I will reserve my comments until you have seen the videos.
http://www.youtube.com/watch?v=ChYHivKP8sA - from back
http://www.youtube.com/watch?v=YuFeuk9Z4NY - arm
http://www.youtube.com/watch?v=r4TJ_RRN_vQ- from front
http://www.youtube.com/watch?v=f0yAtRwasBM - tcs from back
http://www.youtube.com/watch?v=b5kwwVFZN40 - tcs arm
http://www.youtube.com/watch?v=NG3oVzOFd_E - tcs from front