Kenyan 800m runner beats British record-holder at a Diamond League meeting that also sees Berihu Aregawi shine in the men's 5000m and Jakob Ingebrigtsen in imperious form at 1500m
Ruth Chepngetich will defend her title in the Windy City on October 8 against a field that includes London Marathon winner Sifan Hassan and US record-holder Emily Sisson
Sifan Hassan, Eilish McColgan and Eliud Kipchoge are among a new wave of athletes who are measuring their sugar levels with biosensors in a bid to run faster
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