Running does put considerable stress on the body, particularly the heart and lungs. If you try to exceed what you physical condition is capable of, you can possibly do yourself harm. heart attacks are not uncommon among runners who push themselves too hard. However if you know what your limits are do not overstretch them then running is good exercise.
yes. look up the origin for the word NIKE.
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Running has numerous benefits: it is the best exercise for weight loss, it is also the best exercise for stress relief.