This is not something I ever have to worry about.... I tried riding like hell for 3 bursts of 20 seconds the other day and it nearly killed me. My legs were like noodles afterwards. I was inspired by a video on the BBC with Dr. Michael Mosely. I have no idea who he is, but a friend recommended it to me me.
Running too fast and too often may be just as unhealthy as not exercising at all, the Los Angeles Times reports. Researchers in Denmark studied a group of 5,000 people over a 12-year period and found that hard-core runners who routinely jogged at a brisk pace—a 7-minute mile or faster—for four hours or more per week were just as likely to die as those who did no exercise at all. Runners who jogged at a more leisurely pace—roughly a 12-minute mile—for just over two hours per week had significantly lower mortality rates. The findings are in keeping with a growing body of evidence that there is an ideal amount of exercise, and that too much of a good thing can stress the cardiovascular system and the body in general. “There may be an upper limit for exercise dosing that is optimal for health benefits,” says the study’s author, Peter Schnohr. “If your goal is to decrease risk of death and improve life expectancy, jogging a few times a week at a moderate pace is a good strategy. Anything more is not just unnecessary; it may be harmful.”
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