Originally Posted by
Carbonfiberboy
This looks more proper to me:
I usually have my elbows just ahead of my knees, not quite as far as this photo. Does it make a difference? I think it's less tiring and easier to have a straight back with about this much reach.
I think it depends on body proportions. If that rider's torso were shorter and femurs and/or forearms longer, he'd have knee/elbow overlap. No big deal. You want the knees in for aero anyway, if not for biomechanical. And it's hard/awkward to get the elbows narrower than the shoulders.
Plus that rider isn't on the rivet like Boonen is in the other photo.