How Much Cardio Should I Be Doing To Build Muscle?
How much of your exercise routine you devote to cardio and weight training will depend on many factors, above all your personal fitness goals. Some weight training programs are rigorous enough that not much cardio is needed (for example, an intense circuit training routine can provide cardiovascular benefits in addition to body building).
Anyone following a program that relies less on heavy weight workouts would do well to incorporate some cardio exercise into their routine.
Most doctors and health organizatio ns recommend at least 30 minutes of moderate aerobic activity most days of the week for heart health. If your main goal is to build muscles, and build them big, this is probably sufficient for you provided you are sticking to a challenging strength training regimen. If you have a lot of fat to lose, you might want to add an extra 30 minutes 3 days a week to improve your muscle definition.
If your goals are to improve stamina, burn fat and improve heart and overall health, 30-60 minutes of moderate to high-intensity cardio will help you reach your goals faster, but be sure you make time for your strength workouts too, since building lean muscle mass will help you burn more calories even at rest.
Recommended cardio exercises for muscle building: high resistance elliptical machine workouts, high incline walk/jog, rowing, biking with hills, circuit training.