The eleventh season of NBC's weight loss competition The Bigger Loser kicked off Tuesday with a motley crew of hopefuls including a set of identical twins, parents teaming up with their children, and the heaviest contestant in the show's history, 507-pound Arthur. 

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Arthur, a 31-year-old from Portland, Oregon, said with tears in his eyes that he's actually lost 129 pounds in the past year, having previously weighed in at 646 pounds.