Cardio is important in achieving good fitness, but a lot of it could impede your attempts to bulk up through muscle building. If building up muscle is your focus, spend most of your effort on a strength-training routine.Ultimate Alpha Extreme Provide your body with plenty of the right fuel on exercise days. An hour or so before your workout, eat more calories than you would on a typical day. That doesn't mean you can overeat when you are scheduled for a workout, but just be sure to eat a bit more on those days and less on the days you aren't going to be weight training.