I use an unorthodox, but very successful, carb up for shows and photo shoots. Most people start low and taper high. I start high and taper low. This works perfectly with the body's ability to store carbs as glycogen effectively. You basically eat very low carbs for 4 days, then deplete your body with a long high rep workout, and then eat high carb for 36-72 hours. You have to monitor your progress and make adjustments. I've found that you need to consume between 10-12 grams of carbs per kg of lean body mass the first 24 hours of carb loading. Then drop it down to 8-10. The third day depends on how you look. Some need to stay at 10, while others need to drop to 6. It just depends on the person.