FUKUOKA—Like their male counterparts, women in the keirin bicycle racing circuit must endure grueling training sessions and risk broken bones and other serious injuries in the fierce ...

The men's Keirin first round will take place on Saturday at 11:19 a.m. ET. How the Keirin works: Races last about two-and-a-half minutes. In each race, which is six laps (1.5 km or .93 miles) in ...