Let the forearms and hands feel as though they were floating over the manuals, providing just the right amount of weight in the fingertips. Hold the wrists level or slightly sloped back and rather low, avoiding any tilting to the right or left. Allow the well-curved fingers to proceed naturally from the hands without the knuckles protruding upward. Each finger plays the key with a sense of pulling naturally inward--like grasping a ball--rather than pressing downward.
Good finger action will require fingernails to be cut short.