Historical clue formulations

• Gone skinny-dipping, e.g. — 2025-08-03
• Like some Olympic races — 2025-02-13
• Like the start of an Ironman race — 2022-02-04
• Like some Olympic races — 2019-01-11
• Taken a dip — 2018-01-29
• Done the backstroke, e.g. — 2017-08-21
• Done some strokes — 2013-08-02
• Like some Olympic races — 2011-09-23
• Like the English Channel for the first time in 1875 — 2011-05-09
• Like one leg of a triathlon — 2007-07-05
• Like the Florida Straits, rarely — 2006-08-19
• Used strokes — 2003-07-12
• Like laps in a pool — 2002-05-03
• Gone across a pool — 2002-02-25
• Done laps — 1994-09-26
• Having dogpaddled — 1993-12-26