Article: If you don't have a chef knife you can use any other object with a hard flat surface.  You will feel the pit inside the olive start to pop out. This will cause the olive to roll and help in squeezing the pit out. Try to take out the pit in 1 piece while causing the least damage to the fruit.
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Find a large chef knife. Put the olive on a chopping board to avoid creating a mess on your countertop. Place the flat surface of the chef knife on top of the olive and press down. Continue to press down on the olive and gently pull the knife towards you. Maneuver the pit out of the olive with your fingers if it still hasn't popped out.