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In 2023, Rebecca Reid was flying through her championship race, on track to break her 87-minute half-marathon personal best – suddenly, her whole body began to feel like it was on fire.

She sat down and everything became a blur. Regaining consciousness in an ambulance, she overheard paramedics saying her heart rate was over 280 bpm. Doctors warned her she might never run again.

Just two years later, Reid broke the world record for the fastest female marathon with a subcutaneous implantable cardiac defibrillator (S-ICD) at the 2025 London Marathon.