In ancient bodybuilding times (prior to the 80's) it was often believed that the bodybuilder should not incorporate cardio training into their workout regiment to prevent the burning of too many calories and resulting in limited bodybuilding gains or "getting small". As we've all subsequently learned this train of thought could not be further from the truth. Cardio and weight training complement each other extremely well and should always be included as part of your training routine. Cardio training gives you the necessary stamina for weight training and weight training offers added strength and toning for optimal cardio performance.
Nowadays all competitive bodybuilders rely heavily on cardio training in addition to diet to burn fat. There is a fine line between burning fat instead of muscle and experience will teach you what your targeted heart rate should be for optimal fat burning. Just compare some of the smoother bodybuilder of the 70's to the champions today and you will see exactly what I mean regarding the correct cardio mix.
