in some ways cardio is not a musdt as long as you have a caloric deficiti,, but some cardio can be good for several reasons,, as it can help with sticking to the diet also can be necessary to get off last biut of stubborn BF as a competitior,, specially for the girls,,
morning cardio is very good for competitiivbe bodybuilder who is already lean,, for fatty it doesn't matter when you do it just that you do it