Running has always been thought of as one of the healthiest total-body exercises, but how much is too much? After researching the effects of daily long distance running on mice for four months, Dr. James O'Keefe found a pattern of increased heart damage in these mice. When the mice were released from their running regime, their hearts eventually healed. Similarly, a 30 year study on humans found that although runners as a group acquired a 10 percent lower death risk than non-runners, the group of runners who ran more than 20-25 miles per week were equally prone to the death risks of non-runners. The good news is that rest heals! By breaking up your intense work outs with a day off, you can literally save yourself!
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