It depends on your body and activity levels in general. I personally walk all the time to classes since I am an undergraduate so I dont do any additional cardio..but I have always had natural endurance I could probably run a mile in under 6 mins still even tho I have not ran for years. But I focus mainly on my weight workouts and that gets my heart rate up by itself. So I personally do not do cardio. But yes if you decide to do cardio as said above you need to up your calories...which is not fun if you need to get 4000 w/o cardio.
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