As the title says, is there a video that shows how to do this? I don't really understand the concept of drawing from the elbow or shoulder, my arm gets heavy fast if I try to use my shoulder. It's also difficult to control the pen. I've been trying it out with the tablet in my lap but I lose a little control.. I'll be drawing for a long time (hopefully) so i'd like to do it in an ergonomic way.
Thanks in advance!