Hopefully you've been doing your cardio because this workout is definitely going to hit your cardiovascular system! If your heart is racing and your breathing is heavy, it means you're doing the workout right. You'll be hitting all of your muscle fibers, that means that both your strength and endurance will be addressed.
Remember how you felt last week? Use this second shoulder workout to gauge how far you've come and where you'd like to go. Whatever you discover, use it as fuel! Those military presses aren't going to lift themselves!