"Triceps back, biceps forward" sounds like an accurate description of a pendulum stroke, avoiding extraneous movement by freezing the elbow in place. What's wrong with it?
pj
chgo
Im not gonna get into the minutia of how efficient movement works here but will say that I've heard pendulum purists say things like "it's okay if the elbow moves up slightly in the backswing".
I will go one further than them by saying it is not just okay, but that this tiny ossilation you see in the elbow of so many top players makes the stroke much more efficient.
I'm not saying they do this consciously (tho iI'm sure the obvious big moves are for some), but rather that their subconsciously driven stroke is utilizing a charachteristic of vertabrate movement that purely contraction driven movements cannot compete with in efficiency nor force control.
So there's nothing wrong with triceps back, biceps forward, there are just better ways to move is all.
