CARDIO

Set to 2 different clues across 2 published puzzles, most often “Healthful exercise, informally” — The New York Times, Sunday, 6 August 2006.

6 letters

Every clue on record, most used first

Healthful exercise, informallyonce
The New York Times — Sunday, 6 August 2006
Part of many workouts, informallyonce
The New York Times — Saturday, 31 December 2005