My yoga students find out pretty quickly that, when I say this is a simple pose, that will almost never mean that it's an easy one.
What is it about simplicity that we conflate into automatic ease? It's almost never the case; it takes effort and strength to find simplicity, to be simple, to be transparent.
It means you have to say "no" to a whole lot of other stimuli.
And that, for many of us, is the antithesis of easy.