Michael Phelps celebrates a gold medal

Michael Phelps (foreground) celebrates a team win in the men's 4x100m freestyle relay at the 2016 Summer Olympics in Rio de Janiero, Brazil. Phelps and Caeleb Dressel, Ryan Held and Nathan Adrian won gold in the race, finishing in at time of 3:09.92. The medal was the 23rd of Phelps's Olympic career.