Can you do cardio and weighs on the same day?

I do weight training and cardio in the same day. I will lift for usually 1.5 hrs then do 20 min oflight-moderate cardio (fast walk on incline on treadmill). I would advise you to not dostrenuous cardio after or before a workout, that can hinder your gains. Keep the heavy-strenuous cardio to your days off from lifting.