Exercise won’t boost endurance levels for 1 in 5 (The Argus Leader)

About one in five people can train all they want but, because of their genetic makeup, are not likely to see much improvement in their endurance levels, an international team of researchers reported Thursday. Still, the authors caution, their findings shouldn’t be an excuse to throw away the running shoes. “There is a whole host of other physiological responses” to exercise, such as heart rate …
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