As the world's premier backstroker, Aaron Peirsol regularly breaks his own world-record times. Take his 100m backstroke world records for example:

• 53.45  - 2004 Olympics
• 53.17  - 2005 World Championships
• 52.98  - 2007 World Championships
• 52.54  - 2008 Olympics

Olympics
2008
Gold 100m backstroke, World record
Silver 200m backstroke
Gold 400m medley relay, World record

2004
Gold 100m backstroke
Gold 200m backstroke
Gold 400m medley relay

2000
Silver 200m backstroke

World Championships
2009
Gold 200m backstroke (WR)
Gold 400m medley relay (WR)

2007
Gold 100m backstroke
Silver 200m backstroke

For more on Aaron, visit mutualofomaha.com/usaswim.