You would go through the morning workout routine fasted except coffee. After your training, you could consume about 20g of carbs to help with some recovery, but not more than that. Eat your food accordingly throughout the day and then night train with your preWO shake. Have your PWO shake after training and then you can BL. This is a quick synopsis of the protocol, but you can do CBL with 2-a-days and it would benefit you more as you are going to probably be training again the next morning. CNS would have you toooooo depleted to be able to continue 2-a-days regularly.