Take A Breather
Deep breaths raise your body’s blood oxygen levels, which can help increase your energy and alertness by lowering blood pressure and slowing your heart rate. The idea is to breathe deeply into your belly, not your chest. While sitting upright, inhale slowly through your nose and feel your abdomen push out, then exhale slowly through your mouth. Alternatively, a method used for quick energy in yoga calls for quick inhaling and exhaling through your nose while your mouth is closed. It is recommended to take 3 of these rapid breaths within a second, and repeat up to 15 seconds.

Move Around
If you have an office job like so many Americans, try getting a little exercise either on your lunch hour or if you get a shorter break throughout the day. A study from California State University, Long Beach suggested that the participants had a longer time of increased energy after taking a 10 minute walk than they did if they ate a candy bar or other sugary quick fix. The reason that a little brisk exercise works better than a store bought solution is that walking pumps oxygen through your veins and muscles.

Drink More Water
Your brain is made of 83% water, so it just makes sense that if you’re dehydrated it’s not going to function as well as it could or should. Fatigue isn’t the only symptom of dehydration of course, it can also cause depression, confusion, aggravation, constipation, and headaches. Make sure you drink plenty of water, or eat foods that have high water content like fruits and vegetables. Excess caffeine can cause dehydration, so be sure to balance it carefully.

Sudden Dizziness or Chest Pain
Either of these scenarios could signal a serious cardiovascular problem stemming from lack of blood being pumped to your heart or brain.  If you experience these symptoms, you should stop exercising immediately and if they don’t subside then you should seriously consider visiting the ER.  Sometimes symptoms like chest pains or shortness of breath can be caused by sudden pains or muscle cramps, so be sure to have your doctor evaluate you to be sure.

Chills, Headache, or Blurred Vision
If you experience any of these symptoms while exercising in hot weather or inside a hot building, stop immediately.  These symptoms could be a sign of heat stroke, which is potentially fatal.  If you don’t feel better right after stopping, your body temperature could be so high that it needs to be cooled right away to prevent possible brain damage.

Feeling the “Burn”
In order for muscles to gain strength and endurance your body breaks down carbohydrates into lactic acid.  This makes your muscles acidic and causes the burning sensation.  The longer you’re in the burning zone, the longer it will take for your muscles to recuperate for your next workout.  When you start to feel the burning, slow your pace and exercise at a low intensity until it subsides.

Pain or Tenderness That Doesn’t Subside
Overuse injuries to bones, tendons, and ligaments are often preceded by localized soreness on one side of the body.  This soreness will generally get worse with continued exercise, so stop immediately if you feel this sort of pain.  This is different than delayed onset muscle soreness which will typically occur 8-24 hours after intense exercise.  This will usually take a few days to completely subside, so exercise at a lighter intensity until you’re fully recovered.