P90X: Chest, Shoulders & Triceps

This morning I did the first 20 mins of Chest, Shoulders and Triceps.  I'm really fatigued today and don't have much of an appetite.  I suspect this lethargic feeling will continue for most of the week (the joys of being a girl).  Anyway, I'm still going to try to finish this workout tonight and get in some cardio.  I'm feeling like pooh, so if I do get cardio in, it will probably be something lower on the intensity scale like treadmill walking.  Mentally, I want to gut it out with lots of swings and metabolic circuits, but I'm trying to do my best and listen to my body....