LONDON (Reuters) - British amateur runner and triathlete Holly Grundon was delighted to smash a long-held personal speed target - to finish a half marathon in less than 1 hour and 30 minutes.
But the 36-year-old's decision to switch to Nike's Vaporfly trainers before securing her new personal best (PB) time has her wondering whether she cheated herself, or dirtied a sport she's always loved for its purity.
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