'The Biggest Loser': Should you mimic its weight-loss methods at home?

Medical experts weigh in on intense versus moderate workouts for those who are seriously overweight. But no matter which approach you choose, be sure to have a physician's guiding hand. On "The Biggest Loser," contestants arrive fat and leave thin. And in between, they go through an intense fitness regimen that is, to put a good face on it, grueling.

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