“Planking is a powerful pose.” This is the sort of thing my yoga teacher proclaims to exhort me to sweat out another minute.  Surely there is some power involved here, but who knew it was the same kind of power that you might witness in a persuasive meeting, a TED talk, or a board meeting? I trust my yoga teacher implicitly, and as it turns out, it happens that she knows a thing or two about what it takes to…