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The race included the most women's finishers ever with 24,731, as more amateur enthusiasts flock to distance running in the US.
Cheptegei's tragic death sparked anger over the high levels of violence against women in Kenya, particularly in the athletics community.
The 33-year-old, who competed in the marathon at the Paris Olympics, suffered burns to more than 75 per cent of her body in the September 1 attack and died four days later.
Hassan finished in an Olympic record time of 2 hours, 22 minutes, 55 seconds.
While getting through cancer, exercise was unbelievable for all sorts of reasons, says the runner.
The service in the Rift Valley village of Chepkorio was attended by political and sporting dignitaries, including Kenyan President William Ruto and World Athletics president Sebastian Coe.
The 24-year-old set the world record at the Chicago Marathon in October with a time of 2:00:35.
As many as 6,000 runners took part in the GTECH Kerala Marathon of 21 km, 10 km and 3 km in three categories: senior veteran, veteran (45-59 years) and open (up to 44 years).
It's only been three years since 32-year-old Jino Varkey started focusing on the endurance race triathlon, that's spread over the disciplines of swimming, cycling and running. Yet, in his first ever Ironman 70.3 challenge, the Cherthala native finished it in an impressive 6.30 hours, securing 11th
Steve Shanks, from Nottingham, was an experienced runner who finished the race in two hours, 53 minutes, 26 seconds.
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