Help! proper posture for ab-crunch x_x

hi, im new to this forum and i just need some help doing an ab-crunch, i always get the neck/head pain after doing it. Im just wondering if im doing it wrong. Whenever im doing them i keep my head looking up at the ceiling and my chin up.  The distance between my chest and my chin is about a fist. Whats going on? help appreciated.

http://www.findarticles.com/p/articles/mi_m0KGB/is_10_5/ai_n8694262
 
Hope this helps you out!

-Mike



Height:6'2
Weight:254
bf%-13.2
Age:17
Bench: 360
Squat: 475
Deadlift: 515
leg press: 965
**UPDATED:10/2/2005**

FYI: A peach a day, keeps the doctor away!