1. In a large mixing bowl, combine the flour, sugar, salt, and yeast.
2. Add the warm water and olive oil, and mix until a dough forms.
3. Knead the dough on a floured surface for about 10 minutes, until smooth and elastic.
4. Place the dough in a greased bowl, cover, and let rise in a warm place for about 1 hour, or until doubled in size.
5. Preheat the oven to 375°F (190°C).
6. Punch down the dough and divide it into three equal pieces. Roll each piece into a long rope.
7. Braid the three ropes together, pinching the ends to seal.
8. Place the braided dough on a baking sheet, cover, and let rise for another 30 minutes.
9. Bake for 25-30 minutes, or until golden brown.
10. Let cool on a wire rack before slicing and serving.