Regular gym visits 'can wear out your hips in middle age'
Ten years ago it was unusual to do hip replacements on anyone under the age of 55 but now it is commonplace in people in their forties and fifties.
'We are seeing a lot of people in early middle age with significant arthritis and worn-out joints and in many cases it is down to the gym craze.
'People are crippling themselves with impact exercise. It is particularly problematic for overweight people who go to the gym.'
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The best exercise is a 30-minute brisk walk three times a week, but walking doesn't make gyms any money.
'Exercise is being taken in a very forced, unnatural way.'
He added: As your body ages, you should be taking brisk walks, playing a gentle game of tennis or doing some gardening, not be being thrashed in a gym.'