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At 22 years old, Laura Micetich AKA 'The Iron Giantess' weighed over 300lbs and was facing a raft of health issues including hyperthyroidism, high blood pressure and prediabetes. She realised that without a radical change in diet and lifestyle, her precious youth would be lost already and she was facing a short and difficult life.

EXCLUSIVE: Luke Zocchi, who lives near the Hemsworth clan in Byron Bay, works with both Chris and his wife Elsa Pataky, and often helps with shift shape for their blockbuster roles.