Sian Lewis (born 8 October 1976)[1] is a British former pentathlete who competed in the World Modern Pentathlon Championships between 1996 and 2003, winning three gold and two silver medals.
Lewis graduated from and trained at the University of Bath, coming from a swimming/ pony club background before moving onto modern pentathlon.
[3][4] In 1999, Lewis, Cook and Allenby again came second in the team event at the World Championships, and in 2000, Lewis, Cook and sister Gwen Kinsey [it] won the team relay event at the World Championships.
[3][5][6][7] In addition, she also represented Wales in the 2002 Commonwealth Games, coming 12th in the Women's 10m air pistol.
After suffering with anorexia nervosa during the 2002 season, Lewis returned to pentathlon in 2003, winning the team event with Allenby and Georgina Harland at the World Championships.