what i used to do when i did shoalin kickboxing was do pushups and have some one put there hands on the back of my head and they used to provide manual resitance this is a strenghting exercise that will strenten your neck.
if you do it for a while your head will shake less on impact because it doesnt move much, stopping you from being K.O.'d.
also ive seen the head brace sold by MMuscle mentioned by billy earlier but dont know how to use it. so if any one has information on that please could you tell me how to use it and what type of exercises are done with it please.
thanx.