Generally, when your focus is on building muscle you will not want cardiovascular/ aerobic exercise to be the primary stimulus to your body. Though cardio is healthy for your heart, too much cardio - and too high in intensity - will hinder your progress with strength training and building muscle, as well as cause your metabolism to slow down. 

The best way to incorporate aerobic exercise in alongside your weightlifting routine is to keep your cardio sessions lower in intensity and in forms that are more easily incorporated into your day. As a general rule of thumb, look to get in some form of cardio 2-3 days per week, about 20-30 minutes each. 

Click HERE for full recommendations and guidance on cardio.