Yes, you should immediately stop training if you feel dizzy or lightheaded, as this is a primary warning sign from your central nervous system that something is wrong. Dizziness during exercise can be caused by several factors, ranging from benign to life-threatening. Common causes include exercise-induced hypotension (a sudden drop in blood pressure), dehydration, or low blood sugar (hypoglycemia). If you continue to push through, you risk fainting, which can lead to secondary injuries like concussions or broken bones if you fall or drop heavy weights. When dizziness hits, you should stop, sit or lie down (ideally with your legs elevated to help blood flow back to the heart and brain), and sip water or a sports drink. If the dizziness is accompanied by chest pain, shortness of breath, or palpitations, you should seek medical attention immediately. Consistent dizziness during workouts warrants a visit to a doctor to rule out underlying cardiac issues or chronic anemia.