Earth Day Challenge
April 22
| Name | Age | Location | Country | Affiliation | Distance |
|---|---|---|---|---|---|
| Marian Oesterwinter | 44 | Wipperfuerth | GER | 5,073 | |
| Michelle Offord | 56 | Attleborough | GBR | Royal Air Force (UK) | 10,000 |
| James Offord | 59 | Attleborough | GBR | 10,000 | |
| Emeka Ogbugo | 73 | Pretoria | RSA | Virgin Active - South Africa | 12,897 |
| Sid Ogden | 60 | Montgomery, AL | USA | USAF Veterans | 4,883 |
| Jonathan Ogden | 38 | GBR | 5,161 | ||
| Kelley Oglesby | 56 | Gaffney, SC | USA | 2,400 | |
| Joanna OGrady | 56 | GBR | 5,000 | ||
| Dong Oh | 44 | KOR | 5,011 | ||
| Bernard Oh | - | Mainz | GER | 5,000 | |
| Shigeaki Ohnuma | 38 | Shiga | JPN | 4,944 | |
| Ian OHora | 46 | Gorham, ME | USA | 10,000 | |
| Roberto Ojeda | 48 | Launceston, TAS | AUS | 16,000 | |
| Gerardo Okhuysen | 61 | Irvine, CA | USA | 14,000 | |
| Glenn Olander | 126 | USA | 2,977 | ||
| John Olbrys | 37 | Rotterdam | NED | U.S. Coast Guard | 12,299 |
| jim oldfield | 74 | Byron Center, MI | USA | 7,116 | |
| Chris Oldfield | 62 | West Yorkshire | GBR | 6,262 | |
| Milos Olejnik | 56 | Bratislava | SVK | Slovak Indoor Rowers | 7,466 |
| Casper Olesen | 42 | DEN | 7,174 | ||
| Tim Olin | 42 | ACT | AUS | 7,601 | |
| John Olinde | 57 | USA | 22,021 | ||
| Josh Oliva | 51 | USA | 6,639 | ||
| David Olive | 22 | GBR | 8,752 | ||
| Lori Olive | 66 | Kernersville, NC | USA | Triad Indoor Rowing | 4,602 |
| Diana Oliveira | 38 | BRA | 26,893 | ||
| Mário Oliveira | 37 | POR | 8,000 | ||
| Laurence Oliver | 49 | Biggin Hill | GBR | Another Rowing Group | 8,133 |
| Jason Oliver | 55 | Seattle, WA | USA | Mount Baker Crew | 8,899 |
| Simone Oliver | 53 | Southampton | GBR | Fitness Matters | 5,000 |
| Tony Oliver | 56 | Hertfordshire | GBR | Bumders | 10,000 |
| Gerard Oliveras | 42 | ESP | 8,000 | ||
| claire olivia | 23 | USA | 5,836 | ||
| rostaing olivier | 54 | FRA | 19,019 | ||
| Le Saout Olivier | 54 | FRA | 6,602 | ||
| Mark Ollila | 56 | USA | London Business School | 5,275 | |
| Susan Ollis | 70 | Lodi, CA | USA | Team Delta | 3,000 |
| Luke Olona | 48 | Walnut Creek, CA | USA | Washington State University | 17,000 |
| Jon Olsen | 49 | Newcastle , NSW | AUS | 7,219 | |
| Lars Olsen | 59 | Bagsværd | DEN | 9,520 | |
| Rolf Tore Lehmann Olsen | 49 | Halden | NOR | 6,544 | |
| Elise Olsen | 55 | Elmore, VT | USA | Concept2, Inc, Morrisville, VT | 4,157 |
| Walter Olshanski | 47 | USA | 4,043 | ||
| Christopher Olson | 61 | Austin, TX | USA | University of Wisconsin | 9,200 |
| Erik Olson | 51 | Portsmouth , NH | USA | 10,014 | |
| Eric Olson | 57 | Seattle, WA | USA | 16,779 | |
| paul olson | 36 | USA | 5,563 | ||
| Jamie Olson | 45 | USA | 5,358 | ||
| Tim Olson | 64 | Grosse Pointe Woods, MI | USA | 4,762 | |
| Michal Olszanowski | 53 | Wrocław | POL | Polish Indoor Rowing Team | 5,000 |