Most likely sudden changes in blood pressure would do this. Make sure you are not holding your breath the whole time or straining. Control the rate of lifting enough so that you can breath properly. Sometimes people lift so fast that they are essentially holding their breath during a period of several reps and this can lead to lightheadedness. If it tends to happen no matter what you do it is probably something that will subside with time.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.