From EliteFTS:
Board Press: This is a special max effort exercise designed to help strengthen the lockout of the bench press. It is also very effective in increasing tricep strength. This exercise is performed exactly the same as the bench press except you pause the barbell on a board that is placed on your chest. The board for this work out will be two 2 by 4 boards about 12 inches in length. make sure to pause the barbell on the boards before the accent.