you can do this when ever.. same day, off days..... it is advisable that if you are going to do a full workout that you split cardio and lifting... but that goes for most programs.. when I decide to cut I'll be doing this on lifting days, in the morning once to twice a week.
But remember, this is suppose to be done with light weight, if you go heavy you won't make it through 1 circuits. This is suppose to develop endurance.
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