Coiling your arm

well people been saying that coiling your arm like yu do in football can kill your arm. but when i do that it gives me more control. but i want to be healthy so how do i pitch without coiling my arm, but still have all the control and velocity with it.

What do u mean ur coiling ur arm. I dont get it

By COILING your arm - do you mean placing your arm in an ā€œLā€ shape like a quarterback does just before firing a bullet pass?
http://i216.photobucket.com/albums/cc90/CoachBaker/arm.jpg

Or do you mean bending the throwing arm with an extreme angle behind the head?
http://i216.photobucket.com/albums/cc90/CoachBaker/coil.jpg
Coach B.