I would also switch up the workout so you get more out of each rep. Instead of doing all 3 set of curls one after the other, try a set of curls, then shoulder press, then bench press, then tricep, then back to curls. You can switch up the exercises from what I have listed, but you should get the idea. It gives your muscles just enough time to rest before you crank out another set. I personally have a strength day (Mon, Wed, Fri) and a cardio day (Tues, Thur, Sat.) I do a circuit on the strength days and cardio and abs on the cardio days. My workouts are about 45-60 each and I am in and out. This givs each muscle group time to rebuild.
Also if you want size, go heavier weights, less reps. 8-12 for size, 12-15 for definition. Eat lots of protein and take those shakes and some creatine along with your vitamins within 30 minutes of working out. Your muscles will absorb the nutrients much faster and less will be wasted by your body flushing them out.
Good Luck!
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