you can do cardio every day. just don't have them always be "intense." that can lead to overtraining (increased heartbeat, irritability, trouble sleeping) which isn't good. so best thing to do if you want to do non-strength training exercise every day is to not go all out every day, maybe hard one day, easy the next (intense short run/easy long jog) and having one or two days where you do a different type of activity such as play basketball or tennis.
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