After warming up, the swimmers head to the ready room, which became famous this week after showdowns between two sets of competitors.
Michael Phelps glared at South African rival Chad Le Clos as he shadowboxed in front of him. And American Lilly King watched her Russian competitor, who had been accused of doping, on the monitor during the preliminary races and then had some harsh words for her. While Phelps sits quietly with headphones on (probably thinking about the upcoming race), others like his teammate and friend Allison Schmitt are more relaxed and taking selfies. SEE MORE GALLERIES
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Officials check that the swimmers’ equipment (suit, goggles, cap) is legal in the ready room, according to Ryan Lochte in a
video posted by NBC. Of course, this doesn't explain the repeated goggle adjustments swimmers make on the blocks, or prevent faulty equipment like Phelps' cap ripping during the 4x200 freestyle relay. SEE MORE GALLERIES
You may have noticed that some swimmers in the Olympics have some unusual rituals before they race. Find out why they wear coats out to the blocks and why some even drink the pool water before they race.