I have read and heard a lot about doing little or no cardio while on cycle because of the added stress gear puts on the cardiovascular system. But i think its smart to some what work out the most important muscle in the body, The heart. I Am bulking right now, but i still do cardio 3 times a week. Just enough on the tread mill so that you can hold a conversation with the guy or gal next to you. Then i do my workouts!! Just my 2 cents, nothing more nothing less.