A drop in blood pressure and heart rate is what causes you to feel dizzy, lightheaded or nauseous. Doing this exercise will increase your blood pressure to a normal level, making it less likely that you’ll faint. This goes for blood donation, too — if you think you’re about to pass out, cross your legs and give these steps a try. #DonateBlood #GiveBlood #DonatePlatelets #BloodDonor #DonateBloodSaveLives #GiveBloodSaveLives #Fainting #PassingOut #VasovagalSyncope