yea, crossfit is big on talking about that...as well as 'stabilizing the core' ...but, i think it's like Scott said...to do most anything whole body or generating power through the legs you have to 'activate the posterior chain' and 'stabilize the core' or you don't get very far without injury.
i think crossfit talks so much about it simply to get people thinking actively about doing it. i know I'm better for the CF training process....but, it's just one process of many that can probably work just as well.
"George never did wake up. And, even all that talking didn't make death any easier...at least not for us. Maybe, in the end, all you can really hope for is that your last thought is a nice one...even if it's just about the taste of a nice cold beer."
"If you find the right balance between desperation and fear you can make people believe anything"
"Is enlightenment even possible? Or, did I drive by it like a missed exit?"
It's simpler than you think.
I could be completely wrong"