Historical clue formulations

• Staying power — 2025-01-19
• Cross-country runner's asset — 2025-01-08
• Energy needed to power through — 2023-12-04
• Marathoner's need — 2018-02-28
• Staying power — 2017-09-05
• Something a long-distance runner needs — 2016-03-28
• Marathoner's asset — 2013-03-07
• Workhorse's quality — 2012-03-25
• Marathoner's need — 2011-01-23
• Endurance — 2009-01-29
• Legs — 2008-08-10
• Legs — 2006-12-02
• Endurance — 2005-01-05
• Marathoner's need — 2002-09-29
• Staying power — 2002-02-24
• Marathoner's need — 1996-12-01
• Strength — 1996-08-09