It's not how good you are, but how good you want to be
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Testo Muscle Fuel Don't work on enhancing the size of your muscles if you are taking part in a marathon or participating in extreme cardio workouts. Cardio is essential for good fitness, but too much cardio may cancel out your attempts at bulking up through strength training. If building up muscle is your focus, spend most of your effort on a strength-training routine.