Stephie, for those who haven't exercised before, P1 is not the time to start. But if you are used to working out regularly, just be gentle with yourself in P1.
So...if you are really having trouble finding the energy to work out right now, take it easy, okay? It can be hard, especially the first couple days, to have the energy to follow your usual routine. Lift a little less weight, do your cardio at a lower intensity, etc. It's only 2 weeks...you won't sink into flab, I promise.

Only you know what your body can handle, but just listen to it more intently these two weeks, so you aren't pushing yourself too hard, okay?
Like Barb said (she is so good!!!

), if you eat the allowed good carbs (milk, yogurt, bell peppers, tomatoes, beans and legumes), you'll have more energy for your workouts.