Do you remember your parents always reminding you to "stand up straight!". Well, there's a great explanation on why that was such great advice. If you lean your head forward, also known as forward head posture, it can increase the stress on your spine since your head won't be centered over your body anymore. The average weight of someone's head is approximately 10-11 pounds, and can increase to 60 pounds to more you lean your head forward off your spinal column. Forward head posture may indicate that you have a limited or minimal airway since your neck is stretching forward to allow more volume of air to be taken in. In essence, since a narrow airway cannot expand in width, your body will compensate by stretching forward to add more length and subsequently more air can be inhaled.