A look at swimmers training ahead of the Rio 2016 Olympics, which start on Saturday in Brazil. Swimming athletes, from recognisable stars such as Michael Phelps to inspirational stories like Syria's 18-year-old Yusra Mardini competing for the refugee team, are typically some of the highest profile figures at the Olympics.
• More: UAE swimmer Nada Al Bedwawi ready for 'greatest privilege' as flag-bearer










