Using the palm of your hand, roll the oranges across a counter top or table top to soften them for juicing. Cut the oranges in half (through the middle not the stem end) and remove any seeds that you can see. Working over a medium bowl, insert a citrus reamer into the flesh of the orange and squeeze the orange simultaneously to release its juice.
Remove any seeds, and strain if you prefer pulp-free juice. Transfer the juice to a pitcher and serve immediately.