Your other three days per week will be dedicated to chest, back, and arms. Hit legs on abs/cardio day by isolating each body part at the end of your routine.
Nobody ever seems to forget to train their chest and abs, but most don't do chest and abs workouts that train both at the same time.
3 Tips for Strengthening Your Arms, Chest, Abs, Hips, and Shoulders. Fortunately, taking our workout advice will also improve your health along the way, but .