Suggestion - what about just not doing it? Like the article says - it's all physics. No matter fast and precise she is, a small 10 year old girl will have a harder time generating sufficient power to get the break without some risk. And for what? They'll still have concrete blocks around in 5 or 10 years when she's bigger if she still really wants to do that break.
My 10 year old is a hefty guy, and I'm personally not crazy about him breaking boards too much.
Yeah, we haven't had her practice for this reason. I'm not sure the physics works for a small kid. But the master wants all the kids to try, and he's instructed them on how to hold their hand to avoid injury.
My 10 year old is a hefty guy, and I'm personally not crazy about him breaking boards too much.