As a martial artist, it is important to know your power and strength while knowing if your techniques are done right or not.  Therefore, breaking some boards or bricks are part of the game. Even you do taichi, it is still something to good to do to know if your taichi is really practical or not, if you can't break a board, then you can't harm a human being with the strike, don't be silly, it's reality here.  I can use my taichi's techniques on the boards and bricks too and they do work.  So, good luck guys~ I am just sharing you my experience~

Recently, we have bought the rebreakable boards (all new) from Century Martial Arts and here are the force required to break each color (level)...

yellow -can withstand over 70lb (tested with dumbbells standing on the center line)
blue - 125 LB (a lady stood on it and it doesn't break)
red - 145 LB+ (yes, a lady stand on it and it doesn't break, tested with weights)
black - 200 LB+  (even I can stand on it and it doesn't break!)

Breaking them...... VIDEO TIME!

yellow  www.youtube.com/watch?v=8VRG7g-zsKc

blue  www.youtube.com/watch?v=TvZou44c-yg

yellow and blue  www.youtube.com/watch?v=vXKJSHU40os

red  www.youtube.com/watch?v=Lcl68FxYsFY

red and yellow  www.youtube.com/watch?v=aqC_mPDBo7Y

red, yellow, blue
www.youtube.com/watch?v=iSak3ujoHls

black www.youtube.com/watch?v=0o4MvX9zo3g

Full set Break - yellow, blue, red, black stacked together with no spacer : www.youtube.com/watch?v=3QuqeC1JYHk 

Breaking 3 black board stacked together (no spacer)
www.youtube.com/watch?v=piQPnSmffWA

www.centurymartialarts.com/Targets_and_S...

The boards are bought from the link above - Century Martial Arts.

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Just my thoughts,  these boards are not anything you want to miss, they are really good and they don't really wear out as most people say.  They get easier to slide together only but to break it, you have to not slide it apart, you have to snap it apart, and so the sliding easier thing won't affect the difficulties much. I have tested an older board compare to a new board (black) and they are both about the same.  So trust brands that are good like Century, they are not there to cheat for your money, they give good quality stuff!

For normal people, I think breaking the blue board is good for a start already, red is totally different from blue. Don't underestimate the yellow though, it is strong, if a 70lb kid can punch through it, they have output 70lb+ of energy, to the board, good for them!  Superkids~ haha!

Enjoy your breaking!     

Enjoy!