Do no more than 20 sets per muscle group; closer to 12 is even better. Your reps should be between six and 12 per set for the most muscle growth, and your workouts should never last much longer than 45 minutes. In lieu of more volume, use heavier weights and move through each rep at a controlled speed. Your sets should last between 40 and 70 seconds; any less, and you're not tensing your muscles long enough to shock them into growth.
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