On Sunday, Jamaican sprinter Usain Bolt won the men's 100 meters in Rio, retaining his status as the fastest man in the world.
One photo from the day visually defines the career of this record-breaking athlete. It's from the semifinals.
In it, Bolt is leading the pack. He glances over his left shoulder, grinning, just before he crosses the finish line. His competitors are barely nipping at his heels. Everything below the waist is a blur.