Originally Posted by Carbonfiberboy

I'd look to see if there's a 90° angle between the upper arm and torso when in the low hoods position, that is with forearms ~level and back straight. That's really the tell, but normally that also will mean a gap between knees and elbows. It's helpful to use a mirror when one is on the trainer.

Here are some photos I took while I was in a fat phase a number of winters ago:
http://www.bikeforums.net/long-dista...l#post12207030