The Importance of Plane Alignment

In the short and the lengthen positions or anywhere between those two bits is I actually want the shoulder to stay still. So if we're doing a some kind of tricep extension with a cable with our arms, by our sides or slightly in front of us, you know, as Jimbo said, five, 10, maybe 15 degrees of shoulder flexion,. It doesn't mean up to 90 degrees relative to the ground type thing. You've got to try and visualize a line of your hand. Where's that going in space or this line of the forearm? Does that sit perfectly forward and back? Or does it deviate left to right a little bit?