Ever wonder why you yawn, get headaches, and sometimes have nausea when working out?

No worries just another day at the office: The act of yawning itself allows your lungs to open up some of the extra lung spaces you weren’t using all day while sitting at the desk and exchanges a lot of the carbon dioxide your body produced during your warm-up for fresh air to keep you going. That little yawn may be the most time-efficient part of your routine. → The Mayo Clinic recognizes what it calls exertional or exercise headaches as separate from other types such as vascular, migraine, or other serious versions. They point out that exercise headaches are triggered by strenuous activities and reiterate that they are not serious, but offer no cause or cure.→ Activities like lifting weights that require you to tighten your core, also squeeze your insides and increase abdominal pressure. This maneuver, called the Valsalva, can push stomach contents against the muscular sphincter meant to keep the food you’ve swallowed heading in the right direction, which can be painful and cause feelings of nausea. Try eating no less than two hours before your workout to avoid this side effect.