Force/Power + CHI

Dear All

I have two questions.

How would you measure a force of a punch, I would like to do this to
see if I am profressing or if th weight lifting excecises are actually
slowing it down.

The second question is I watched 'mind body and kick ass moves' and
the demonstrations on chi are very impressive is there ademonstration
that an average person can do to shoe that it exists.

thanks

G
.