A journalist recounts how he used ChatGPT to develop a fitness plan to prepare for the Paris Marathon, resulting in a 20-pound weight loss and faster race times (Derek Wallbank/Bloomberg)

Derek Wallbank / Bloomberg : A journalist recounts how he used ChatGPT to develop a fitness plan to prepare for the Paris Marathon, resulting in a 20-pound weight loss and faster race times —  Six months of pain and progress, 20 pounds lost and a trial-and-error test of what AI can — and cannot — do.

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