Do you find that you fit your bike well but your hands are tired or sore at the end of a ride? You may not be switching your hand position often enough. Doing this will release tension in your hands, arms, neck, and shoulders. All of the things that cyclists need to do to develop: speed, force and power require efficiency. If you are tensed up because you have maintained the same position or white knuckling it in a race you are not being efficient.
Change up your hand position every few minutes and keep your elbows bent.