Looking at this video you can actually understand the whipping of your arm for pitching. I hope all like the videos I post and maybe help you.
[video=youtube_share;YH4fWrI_fZ0]http://youtu.be/YH4fWrI_fZ0[/video]
[video=youtube_share;YH4fWrI_fZ0]http://youtu.be/YH4fWrI_fZ0[/video]