Thai brides-to-be do the maths task in the “Running of the Brides” event in Bangkok, Thailand, 02 December 2017. Six hundred of to be brides and their grooms compete a run race aimed to win more than two million baht (61,000 US dollars or 51,000 euro) of wedding package prizes including a pair of white gold diamond rings and honeymoon trip to the Maldives. (Photo by Rungroj Yongrit/EPA/EFE/Rex Features/Shutterstock)





A couple dons their running shoes during the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





A Thai groom-to-be does up his bride-to-be shoelaces before competing in the “Running of the Brides” event in Bangkok, Thailand, 02 December 2017. (Photo by Rungroj Yongrit/EPA/EFE/Rex Features/Shutterstock)





A bride stretches before the event during the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





A Thai bride-to-be and groom-to-be groom warm up before competing in the “Running of the Brides” event in Bangkok, Thailand, 02 December 2017. (Photo by Rungroj Yongrit/EPA/EFE/Rex Features/Shutterstock)





Couples line up before the event during the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





Brides-to-be participate in the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





Brides run along the roadway during the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





Brides run while participating in the race during the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





Brides compete in the race in their wedding dresses during the “Running of the Brides” race, in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)





Thai groom-to-be Nutthawut Nakajun carries his bride-to-be Jirawan Kirdsang as they compete in the “Running of the Brides” event in Bangkok, Thailand, 02 December 2017. (Photo by Rungroj Yongrit/EPA/EFE/Rex Features/Shutterstock)





Thai brides-to-be compete in the “Running of the Brides” event in Bangkok, Thailand, 02 December 2017. (Photo by Rungroj Yongrit/EPA/EFE/Rex Features/Shutterstock)





Thai brides-to-be compete in the “Running of the Brides” event in Bangkok, Thailand, 02 December 2017. (Photo by Rungroj Yongrit/EPA/EFE/Rex Features/Shutterstock)





Naree Phavasanta, left, and Suparoek Charoenphol celebrate while crossing the finish line to win the Running of the Brides in Bangkok, Thailand, December 2, 2017. (Photo by Athit Perawongmetha/Reuters)