Your "flex" muscles are a boon for your self-esteem. When you can pump a nice peak on your biceps, all will seem right in the world. For all the good that chest, back, and leg workouts do for your overall physique, health, and strength, arms workouts seem to have the greatest effect on your attitude.
So, today, stand in front of that mirror. See yourself as you are and envision how you want to look someday. Each superset and rep will take you closer. Move quickly between the exercises in each superset.