Most often, the reason they give on why they use treadmills is convenience rather than preference. Treadmills are preferred and popular in smog-filled urban areas and outdoor running are enjoyed by those in suburban places where smog is not yet a menace. Treadmills There are many reasons given by treadmill users and fans regarding their preference of the gym s most-used equipment. The surest way to incur injuries is to overtrain and overwork your body. Sadly, many runners, in an attempt to increase their mileage and intensity just too soon, pushes their body beyond its capability and so put their selves at a great risk of injury. Two things you need to remember. One, weekly mileage increase shouldn t be more than 10%. If your pulse rate is higher today than yesterday, it means you are overdoing your exercise. Continue your running program when your heart beat normalizes. Lastly, listen to your own body. After running, it is normal to feel tired. There could even be tolerable muscle pains. Be alert when you feel dizzy or experience chest pains after the activity. At the start, their body demands more oxygen, but will learn to adjust to the decrease in oxygen. In time, the body becomes more efficient in processing the limited air. Runners who swim often have excellent breathing efficiency. Breathing rhythms Sometimes, in long races (or even those short races) a runner may lose focus and is thrown out of his breathing rhythm. Running helps lower blood pressure by maintaining the elasticity of the arteries. During a run, the arteries get exercised as well, what with all the blood moving about. Running also maximizes the lung s potential, keeping it strong and powerful. Deep breaths force the lungs to use more tissues, but half of both are unused. Factors include weak or tight calf muscles, excessive uphill running, overpronation, wrong shoes, abrupt changes in distance and speed, and weak ankle joints. Achilles tendonitis is categorized into two: acute and chronic. The pain associated with acute tendonitis only lasts at the beginning of the run and may ease during and after the exercise.