they find the most vulnerable point to break.

to withstand the blow, one must have enough strength on their bone and knuckle / fist / wrist...

so hypothetically, the body needs a period of training to strengthen the arms / wrist / fist / palm. and the accuracy for them to hit the weak point.... that's the way to test whether they got enough training / to test their ability.

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Added on February 25, 2010, 11:55 pmunder the "techniques"

http://en.wikipedia.org/wiki/Breaking_%28martial_arts%29

This post has been edited by 9876789: Feb 25 2010, 11:55 PM