Exercise orthodoxy... debunked!

Just have a look at archival footage of Americans in the 50s happily submitting to an enormous rubber band jiggling away the unwanted pounds and it's apparent that exercising theories have undergone nearly as many alterations as baby-rearing. From Canadian Broadcasting, via Cory Doctorow, come these potentially busted myths:

First on the agenda is stretching. For decades stretching has been seen as an essential preliminary to a workout. But according to Dr. Ian Shrier of the faculty of Medicine at McGill University, and past president of the Canadian Academy of Sport Medicine, that's old, and bad, advice. Research has shown that pre-workout stretching decreases performance and doesn't protect against injury.
Dr. I-Min Lee, a professor at Harvard Medical School and the Harvard School of Public Health has studied people who pack all their exercise into one weekend binge. She discovered that if you have any risks for heart disease, being a weekend warrior is as bad as getting no exercise at all.
Most surprising is that exercise can have no effect at all on some people. Dr. Claude Bouchard, Executive Director of the Pennington Biomedical Research Center in Baton Rouge, Louisiana, discovered early in his career that there's enormous variation in how people respond to cardiovascular exercise, with some not responding at all.

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