Competitive swimmers and coaches count 20 laps for a 500-yard swim in a 25-yard pool and 30 laps for a 1500-meter freestyle in a 50m pool.

These definitions and water temperature ranges seem like a good compromise among swimmers around the world

Courtesy of WOWSA, Huntington Beach. DNF usually means Did Not Finish. But DNF occasionally also means Did Not Fail or Did Not Freestyle. Compared to the significant number of successful swims in contemporary times relative to the 20th century, DNFs seem to be only occasionally publicly shared. “People can learn from swimmers who DNF’ed. Some