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Exercise and health
It is widely recognised that exercise is good for the prevention of a large number of illnesses. This conclusion has been drawn in large measure from observational studies that follow a group who choose to exercise and then compare them with a group who choose not to. This method can lead to a number of biases in terms of other health behaviours; for example, women who took hormone replacement therapy (HRT) were long thought to be protected against heart disease on the basis of observational studies, but a later randomised trial proved there was a higher heart attack risk with HRT, highlighting the value of the randomised trial design. Although there have been a number of trials, much uncertainty remains about what sort of exercise, …
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