The fastest of all the sports at the Winter Olympics, the bobsleigh sees teams squeeze themselves into a tiny metal pod and shoot down an icy track at almost 100mph.
The person sat in the front of the bob steers and the one at the back is the brake-man, who gets the important job of stopping the bob at the end of the run.
As with most speed-driven sporting events, the start is crucial to the team's success.
Once the bob is moving, the driver has to do their best to keep it away from the walls of the course as any contact will slow it down.
In Olympic events each team has four timed runs, with all four times added together to decide the winner.