Season
- Season 0 1999-07-13
- Season 1 1974-03-03
- Season 2 1974-11-03
- Season 3 1976-01-04
- Season 4 1977-01-05
- Season 5 1978-01-04
- Season 6 1979-01-04
- Season 7 1980-01-15
- Season 8 1981-01-06
- Season 9 1982-01-10
- Season 10 1983-01-18
- Season 11 1984-01-17
- Season 12 1985-01-15
- Season 13 1986-01-21
- Season 14 1987-01-20
- Season 15 1988-01-19
- Season 16 1989-01-17
- Season 17 1990-01-09
- Season 18 1991-01-08
- Season 19 1992-01-14
- Season 20 1993-01-05
- Season 21 1994-01-18
- Season 22 1995-01-08
- Season 23 1995-10-10
- Season 24 1996-10-01
- Season 25 1997-10-07
- Season 26 1998-10-06
- Season 27 1999-10-05
- Season 28 2000-10-24
- Season 29 2001-10-02
- Season 30 2002-09-03
- Season 31 2003-09-30
- Season 32 2004-09-28
- Season 33 2005-09-20
- Season 34 2006-09-05
- Season 35 2007-10-09
- Season 36 2008-10-07
- Season 37 2009-10-06
- Season 38 2010-10-19
- Season 39 2011-09-07
- Season 40 2012-10-10
- Season 41 2013-09-11
- Season 42 2014-09-10
- Season 43 2015-09-16
- Season 44 2016-09-07
- Season 45 2018-01-10
- Season 46 2019-01-02
- Season 47 2020-02-05
- Season 48 2021-01-14
- Season 49 2022-02-02
- Season 50 2023-02-01
- Season 51 2024-01-31
- Season 52 2025-01-22
- Season 53 2026-01-21
Season 53 Episode
- Season 35 Secrets of the Samurai Sword
- Season 35 Ghost in Your Genes
- Season 35 Marathon Challenge
- Season 35 Sputnik Declassified
- Season 35 Judgment Day: Intelligent Design on Trial
- Season 35 Master of the Killer Ants
- Season 35 Missing in MiG Alley
- Season 35 Absolute Zero: The Conquest of Cold
- Season 35 Absolute Zero: The Race for Absolute Zero
- Season 35 Secrets of the Parthenon
- Season 35 Astrospies
- Season 35 Ape Genius
- Season 35 The Four Winged Dinosaur
- Season 35 Cracking the Maya Code
- Season 35 Car of the Future
- Season 35 A Walk to Beautiful
- Season 35 Lord of the Ants
NOVA - Season 35 Episode 3 Marathon Challenge
7.00 55 minutes Can anyone run a marathon? How do you run 26.2 miles if you have trouble making it around the block? With good coaching, discipline, and lots of group support, as NOVA shows when it follows 13 generally sedentary people through a training regimen designed to prepare them for an ultimate test of stamina and endurance. Produced in cooperation with the Boston Athletic Association®, which granted NOVA unprecedented access to the 111th Boston Marathon®, and Tufts University, "Marathon Challenge" takes viewers on a unique adventure inside the human body, tracking the physiological changes that exercise can bring about.
