Help: Should I take part in this karate demo?

Question:In this martial art demonstration I will jump on a guys stomach from a chair so he can show how to take impact.

Something like this clip:
http://www.youtube.com/watch?v=c_1rdll3-...

Should I take part as it looks like fun and one of my instructors asked, but I am worried about injuring him.

P.S. I weigh 105 pounds.

Answers:

Why is it that Castillo gets fined and suspended yet all James toney has to do is pass a few drug tests?

If he asked you should do it. 105lbs is not heavy (when you compare to an average adult)

Who won in Pacquiao-Morales 3 The grand Finale?

I am willing to bet the instructor would not have asked you if he did not think he would be ok. I say go right ahead.

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