By not rewarding based on "the best" (which implies comparison) and instead based on performance. Set realistic and definable targets for such rewards and follo

By not rewarding based on "the best" (which implies comparison) and instead based on performance. Set realistic and definable targets for such rewards and follow through. Additionally, communicate these targets clearly. Allow for additional rewards for team performance. I believe this maximizes the motivation you get from rewards both on an individual and team level creating the "best" you can get. Although, realize, studies have shown rewards generally don't impact performance greatly.