Synchronized swimming, or synchro for short, has been called the most difficult sport in the Olympic Games.
This year, Anita Alvarez and Mariya Koroleva will be the only swimmers representing the United States in synchronized swimming during the summer games in Rio.
At 9 years old, Koroleva emigrated to the United States from Russia, took up synchro and became so good she swam for Stanford University and competed in the 2012 Olympic Games in London.
"You have to show up every day and you have to be on your best game every day, even if you're not feeling well," she said. "You have to push through it."
Alvarez, 19, has synchronized swimming in her blood. Her mother is a former synchro athlete and a current coach. Both athletes said they gave up traditional upbringings to become fierce competitors.
The duo's coach, Lolli Montico, said the athletes are training from 7 a.m. until 5 p.m. This will be Montico's third Olympics coaching synchro swimmers.
Montico said the Olympic-caliber swimmers must have two things: legs and attitude.
"Beautiful shapes of the legs — it's so important in synchro," Montico said. "It's the attitude. Attitude is everything."
Koroleva cannot wait for Rio, when all of the hard work is rewarded.