will this mess up my neck?

Dr. Hannibal Lecter · Yahoo User

i have been doing this homemade neck excercise. i put 56lbs of dumbbel in a shoe box and connect it to one end of a xertube (if you dont know what it is look it up on yahoo image) and connect the other end of the xertube to a hat. i put on the hat and walk forward and you can feel it pulling your head back. i keep walking until i am about 15 or so feet away and i move my head up and down slowly for reps of 100. or i just stand there and hold for a min or so.after the work out i feel my neck kind of sore but when i rotate my neck to stretch it my atoms apple kinda hurt. why is that? i dont feel that i am doing anything wrong. i think this is a pretty good exercise for making the neck thicker and stronger. what do you think?watisman i dont want to break my neck in half