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Quote: "But the emerging science does suggest that there may be a threshold of distance, intensity or duration beyond which exercise can have undesirable effects."
And that's the $64,000 question. Most stressors are good for you in small amounts, neutral in moderate amounts, and toxic in large amounts. Defining the ranges is crucial. They may well vary from person to person because of genetics, training, and diet. My guess is that PBF errs on the side of not enough exercise rather than too much, but then I did 2-5 hours per day of chronic cardio 6 days a week from age 9 to age 19, so I'm probably biased.
It seemed like a reasonable control group to me. For years it was sort of general knowledge that people who did too much (relative, I know) and not enough or any had similar life expectancy. There was some more general study done in the 80s, if memory serves, that simply looked at the ages of premier athletes at death which look about the same as for sedentary people.
This time, like all times, is a very good one, if we but know what to do with it. Ralph Waldo Emerson
Any given day you are surrounded by 10,000 idiots. Lao Tsu, founder of Taoism
Isnt this exactly what Mark says? Those people were either ultra-chronic cardio'ers (100 marathons plus - AFAIK Mark recommends doing 2 in your whole lifetime - if you must) or rowers/runner that were competing on a national level. I believe it is rather well established that in order to be internationally competitive you must do some rather harsh things to your body that are not generally considered healthy...
Most stressors are good for you in small amounts, neutral in moderate amounts, and toxic in large amounts. Defining the ranges is crucial. They may well vary from person to person because of genetics, training, and diet.
I once drank some Ajax cleaner when I was younger (3 years old). My grandfather ended up calling me Ajax for a few months after that.
In all of the universe there is only one person with your exact charateristics. Just like there is only one person with everybody else's characteristics. Effectively, your uniqueness makes you pretty average.