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Extreme workout DVDs. Squats and lunges with weights. High impact training. They're all popular - but are these exercises risking more harm than good? We've had a warning that training like this is becoming a serious health risk for young people. Asian Network's been told - by an expert surgeon - that people under thirty are picking up injuries you'd expect to see in people older than fifty. Some are going under the knife for complex operations. Adam Pasternicki has more. (Photo Credit: Getty Images)