After watching Usain Bolt win his THIRD Olympic gold medal, you might be thinking he's unbeatable.
Well, here's your chance to beat him at what is arguably the hardest part of the race - reacting to the starting gun.
The NY Times has posted an online game where you can try react faster than Bolt. I've been trying the last couple of hours, and the closes I can get is 0.247 seconds. Beat that!