Karate Breaks

That ICE stuff!! Not very long time ago, I saw somw ice on a little box or whatever it is called in english... I thought it was very thin, cuz it looked thin, so I smashed my hand with all my power into it, and it did not even broke. But my fingers felt like they were broken! So I used my feet to "ELLIMINATE" it, and saw that it was more than 5 CENTIMETRES thick!! I could feel that in more than a week, so I think its incredible those dudes can do it with that much ice!:-)