Running Notes:
The higher you lift yourself off the ground when running, the greater the shock you have to absorb when landing and the faster your legs will fatigue. To minimize bounce and save energy, run lightly, land softly on your feet, and focus on a faster turnover. Try to keep your feet low to the ground with shorter strides.

Your arms can help you keep your stride low and short. Keep your arms bent at a 90 degree angle and concentrate on swinging them lower and shorter. By keeping your arm swing lower and quicker, your legs will stay lower to the ground -- resulting in a shorter stride.

Also, don't be a toe runner or a heel-striker. If you land on your toes, your calves will get tight or fatigue quickly and you may develop shin pain. Landing on your heels means you have overstrided and you're braking, which wastes energy and may cause injury. Try to land on the middle (ball) of your foot, and then roll through to the front of your toes.

And when you're running, you should breathe in and out through your mouth. Your muscles need oxygen to keep moving and your nose simply can't deliver enough. Deep belly breathing allows you to take in more air, which can also help prevent side stitches.