Now this could have been a bit awkward.
Just moments before the Olympic road race started at Copacabana beach, Chris Froome had to be prompted by a BBC journalist to register.
The three-time Tour de France champion is seeking to join Sir Bradley Wiggins as the only Tour winner to win Olympic gold in the same year. But he very nearly blew his chances as he was unaware his name was being called over the public address system.
-- Chris Froome (@chrisfroome) August 4, 2016
Riders must sign in before races, but Froome had forgotten - that was, until the journalist shouted over the barrier. Phew.
The British team of Froome, Steve Cummings, Geraint Thomas, Adam Yates and Ian Stannard were on the front of the peloton as they rolled over the start line for the 237.5-kilometres race.
The race began by rolling towards the first of four laps of the 24.7km Grumari Circuit, which features two punchy climbs.
Two laps and a loop of the 25.5km Vista Chinesa Circuit, which features the steeper ascents, follows.
There will be a descent to the finish at Copacabana, which could be decisive.