It is common to feel dizzy when you stand too fast from lying down or sitting after exercise. Fainting or dizziness can occur from a simple shift in the body that pulls the blood flow down. Why do I get dizzy when I exercise?
Fitness sessions require a severe amount of energy, and it is normal for you to feel a little exhausted. However, your fitness session should never make you feel dizzy, if you take the proper precautions for your body, that is.