we use '#3 Pine' 1x12....the length/width depends on age, adults break 11 or 12 inch pieces, Blackbelts 2 or 3 inches, several pieces at once.
The brick thing is a demo thing. Spruce is easier to break.
We use re-breakable plastic boards for tests (it's a requirement from redbelt on)
I prefer wood over plastic...the latter you have to be much more precise in your technique.
it is a way to see flaws in the delivery of your strikes, especially the plastic will not cooperate when it's not right. And usually the only way you can really use full power and appreciate the impact of it.
and if you think the boards are defenseless...you are wrong....especially plastic bites back....so while you train to pull your kicks back...breaking you better leave it out till your holders release it....
