My philosohpy for working out is to do the hardest things first. It's easy to start with the ego pumping workouts like pushups and bicep curls, much more difficult and humbling to start with the most "hated" workouts.
I do not allow myself to work my upper body if I haven't worked my lower body before that, my sequence is 10-20 minute core workouts, then hips and glutes workout, then leg workout. If I don't do that, I won't train my upper body.
Remember, you are as strong as your weak links, it doesn't matter that you have super biceps if you costantly have back aches because you bent over to lift a fork.
Workout for health and longevity, only after that add in the more cosmetic stuff if you want it.