This will change up some of the muscle group and exercise combinations and since you will be focusing on less muscle groups in a particular training session your body will be able to handle heavier poundages during the workouts. Remember, progressive overload is the key. Switch programs altogether. This is the option I would choose. Variation in a training program is always positive.
New stimuli create the all important progressive overload, and, that again keeps the progress going.
Remember this, you don't have to do the new program for the entire 12 weeks. This is a great way to continue shocking your body for optimum results. I have designed the programs to have a common thread that runs through each and every workout that is 12 weeks in length. This common thread is something called the Periodization Model . The Periodization Model is demonstrated graphically in the fitness info button on our site.