Shops commonly call lower end bikes "endurance bikes" because they often have higher handlebars and encourage a more upright seating position. That position is more comfortable for people with less flexibility, which is most common on people with less riding experience. If you want to make a 105 or better equipped "racing bike" ride like an "endurance bike" just keep the stem flipped up (or use a steeper rise stem to get the bars even higher) and move the saddle a little further back (with a setback seatpost if needed). Voila.