The key to road bike fitting is not only to give a rider their most powerful and efficient position, but also provide a level of comfort that virtually makes their bike disappear. 

 

A properly done bike fit not only adjusts the bike to the rider/racer's unique biomechanics, experience, goals etc, but also facilitates or enables the rider to posture in this position with as little effort as possible.  Many fits force the rider to work too hard to sit in there strongest position.