Originally Posted by
Jiggle
What you do is lock your elbows (maybe straighten your arms is a better description) and let your torso sag in between your shoulder blades. It's hard to explain. But man it feels great.
You must always ride on perfect pavement. Elbows slightly bent is necessary when dealing with bumps or voids in the pavement. That should be your preferred position. You need to remain loose to allow the bicycle to react beneath you. It's easier on your body and your bike.
That being said, I do occasionally perform the maneuver you describe to stretch out my back momentarily, but I make sure the road ahead is smooth before I do it.