Tim O'Donnell

His genetic predispositions put O'Donnell at risk for a 'widowmaker,' but now he says he's been cleared for a return to full training.

The type of heart attack is colloquially known as "the widowmaker"—but the Kona runner-up says he's doing better now.

Successful parent-triathletes share their tricks and tips for making it all work.

Aquasphere’s new initiative, A Lens for Every Condition, helps you pick a lens specific to your training or racing light conditions.

In this Triathlete Live sponsored by Tonal, Triathlon's favorite power couple chats about their hopeful race schedules for 2021, balancing training with a young family, their biggest race mistakes, and more.

Kona runner-up Tim O'Donnell talks about what he learned after bouncing back from an injury last year and how a brownie helped him win over Mirinda Carfrae.

American Tim O'Donnell, who is fresh off of a second-place finish at the 2019 Ironman World Championship, joins us in our studio in Boulder to talk all things triathlon.

Join us for TriathleteLive with Tim O’Donnell, who just finished second at the 2019 Ironman World Championship.

The American had a rough lead up to the 2019 Ironman World Championship, but he persevered and turned in a stellar race to finish second in 7:59:40.

After his fourth-place finish last year, American Tim O’Donnell is back on the Big Island looking to better that this weekend.

A look at the Trek Speed Concept American Tim O'Donnell will ride at Saturday's Ironman World Championship.

Just a few days after stepping off the podium at Ironman Boulder, Tim O’Donnell and Matt Hanson joined Triathlete.com for our Facebook Live AMA show this week.

O'Donnell talks about the drastic changes he's made in his training, the head-to-head battle with Braden Currie, and managing the balance of parenthood with elite-level racing.

Bob Babbitt chats with Tim O'Donnell, fourth-place finisher of the 2018 Ironman World Championship.

Tim O’Donnell will be riding a Trek Speed Concept Project One ICON Team in size large.

Bob Babbitt chats with the United States' Tim O'Donnell before the 2018 Ironman World Championship.

American Tim O'Donnell is looking to return to the podium at this weekend's Ironman World Championship in Kona.

"As a person, Mark's [Allen, his coach] biggest complaint about me is that I'm too nice."

Boulder provided a picturesque backdrop for athletes from around the world Sunday at the 2017 Ironman Boulder triathlon.

This weekend O'Donnell is literally from home, aiming to earn his Kona start this fall.

American Tim O'Donnell didn't have the finish he was hoping for, but he says he's proud of how he fought through the day and gambled to go for the win.

Tim O'Donnell will race aboard this hand-painted Trek 9 Series Speed Concept at Saturday's Ironman World Championship.

American Tim O'Donnell says that his third-place Kona finish in 2015 has given him the confidence that he knows he can win this race.

Tim O'Donnell recaps his risk-taking day and how he felt during his race to third.

We followed American Tim O'Donnell during an easy run a week out from the Ironman World Championship.

Tim O'Donnell's custom-painted Trek Speed Concept will hopefully take him to a fast bike split this weekend.

2013 Ironman Brazil Champion and top American triathlete Tim O'Donnell shares what he brings on his long runs.

Earlier this year, Tim O’Donnell announced he was switching coaches to work with six-time Ironman world champion Mark Allen.

Linsey Corbin, Ben Hoffman, Terenzo Bozzone and Timothy O’Donnell share their best triathlon tip.

Athletes competing in Sunday’s inaugural Challenge St. Andrews triathlon woke up to blue skies and beautiful conditions.

The American is widely considered the country’s top prospect for bringing home the Ironman world title.

Tim O'Donnell announced today that he is seeking a cyclist and runner to join him on a relay team at the full-distance Challenge Atlantic City on June 29.

Bob Babbitt chats with two-time Ironman world champion Mirinda Carfrae and Ironman Brazil champion Tim O'Donnell.

Attendees packed the house at Runner’s Roost in downtown Denver last night for a very special evening presented by TriRock Colorado.

The United States' Tim O'Donnell and the Czech Republic's Radka Vodickova earned the wins at Sunday's Ironman 70.3 St. Croix.

The United States' Tim O'Donnell and the Czech Republic's Radka Vodickova came out on top at Sunday's Ironman 70.3 St. Croix triathlon.

American Tim O'Donnell has announced that he is now being coached by six-time Ironman world champion Mark Allen.

The Challenge Family announced today that Mirinda Carfrae and Tim O’Donnell will take part in two of their upcoming Challenge North American events.

The 2013 Ironman Brazil champion is the latest athlete to join the running shoe brand.

Less than a month out from their wedding day, we have some fun with the superstar triathlon twosome of Tim O’Donnell and Mirinda Carfrae.

Why pros loafing to an Ironman finish shouldn’t be castigated.

This Saturday, some of the top pros in Ironman triathlon, including Kona champ Mirinda Carfrae, will be competing in Panama City Beach, Fla.

It was Tim O'Donnell (USA) and Mirinda Carfrae (AUS) who reigned supreme as the fastest pair in the race.

Top finishing American Tim O'Donnell says he is happy with his fifth-place finish in Kona.

2013 GoPro Ironman World Championship fifth-place finisher Tim O'Donnell joined Bob Babbitt on Breakfast with Bob and Paul.

A look at the patriotic bike American Tim O'Donnell will ride on Saturday's Ironman World Championship.

Ironman Brazil champion Tim O'Donnell (USA) climbs toward Scenic Point on the famous Queen K Highway portion of the Hawaii Ironman course.

How do you balance the need to keep pace with the front of the race while making sure to stick to your own game plan?

2013 Ironman Brazil champion Tim O'Donnell sits down with Bob Babbitt and Paul Huddle on Breakfast with Bob and Paul.

Tim O’Donnell narrowly missed the elusive eight-hour mark, finishing in a course record time of 8:01:31.

Two-time Ironman world champion Tim DeBoom shares his thoughts about what it takes to win, and which Americans might have it.

American Tim O'Donnell reflects on his 70.3 San Juan race, talks a little bit about his competition and gives advice for dealing with cold water.

Sunday will be just the third time Ironman 70.3 San Juan has taken place and there are only two winners in its young history.

Some couples meet through friends, at a bar, on Match.com. Mirinda Carfrae and Tim “T.O.” O’Donnell met in the med tent.

A big sponsorship coupled with the news that O’Donnell will marry Mirinda Carfrae in December means he is set up for an eventful 2013.

Tim O'Donnell announced on Jan. 3 that he was joining forces with Trek and would be part of the Trek/K-Swiss Triathlon Team for 2013.

Bob Babbitt and Paul Huddle welcomed American Tim O'Donnell to the Breakfast with Bob and Paul set in Kona, Hawaii.

Tim O'Donnell exited the bike with the main chase group and then held on for fourth at the Ironman World Championship 70.3.

Tim O'Donnell will look to add another world title to his resume this weekend at the Ironman World Championship 70.3 in Henderson, Nev.

As Timothy O’Donnell tackles the iron distance, he steps into the role as an American with a legitimate shot at ending the U.S. drought.

Plus, the fast-running American shares his favorite workouts and training music.

Every week we'll bring you a video of a different pro in transition so you can pick up tips and apply them to your own race.

Ironman 70.3 U.S. Champion Tim O'Donnell, who is also an ambassador for Team RWB, will be speaking at an event in his hometown.

Watch first-place finisher Tim O'Donnell and second-place finisher Sebastian Kienle cross the finish line in Galveston.

The 2012 Ironman 70.3 U.S. Pro Championship saw two Americans come out on top.

He won Ironman 70.3 San Juan less than two weeks ago and now he's in Galveston to race one of the toughest 70.3 fields ever assembled.

Get a look at Tim O’Donnell’s and Luke McKenzie’s Ironman Hawaii cycling power data.

Several of the sport's top Ironman stars are set to race at this weekend's Ironman Arizona triathlon in Tempe, Ariz. Eight of the athletes gathered at Tempe Town Lake for Friday's Pro Panel.

Thanks to a race date six weeks after the Ironman World Championship, Ironman Arizona will welcome one of the toughest pro fields of any Ironman this year.

The Kona course has a way of humbling—no, demolishing—athletes like no other Ironman. The heat, the unforgiving course, the world championship-demanding effort—and did we mention the heat? We spoke with three top pros forced to pull out of last Saturday’s race and asked them what ultimately ended their day and dashed their Kona hopes.

Everyone has an opportunity to help Tim support Team RWB by bidding for an incredible piece of triathlon memorabilia: a brand new set of Profile Design Volna Carbon Aero Bars signed by 19 of the best triathletes in history.

Tim O’Donnell is believed by many to be the best hope for an American to reach the podium in Kona this October and the former short-course racer will take his first crack at the Big Island aboard the all-new Argon-18 E-118.

Tim O’Donnell went to the A2 Wind Tunnel in North Carolina with his Cycling Performance Adviser Mat Steinmetz to optimize his position on the new Argon 18 E-118.

Catch up with American Tim O'Donnnell the day before he competes at Vineman Ironman 70.3.

Multi-sport stars were out in force at Sunday’s Boulder Peak Triathlon, part of the newly established 5150 Triathlon Series and a qualifying event for the Hy-Vee 5150 U.S. Championship.

Enjoy the following gallery of Tim O’Donnell, which features some outtakes from our photo shoot with him in Tucson, Ariz.

Inside Triathlon magazine’s July/August issue features an exclusive profile of Tim O’Donnell, who recently made his Ironman debut with an 8:09:50 runner-up finish at Ironman Texas, behind Spain’s Eneko Llanos.

Inside Triathlon editor-in-chief Courtney Baird breaks down what happened in the triathlon twitter world this week.

Americans Tim O’Donnell and Kelly Williamson beat out tough competition to take the victories at the inaugural Ironman 70.3 San Juan event in Puerto Rico.

USA Triathlon has named Laura Bennett and Matt Chrabot the Olympic/ITU Athletes of the Year for 2010. Tim O'Donnell and Amy Marsh are the Non-Olympic/ITU Athletes of the Year.

In this Tweet of the Day, Mirinda Carfrae's boyfriend Tim O'Donnell gives her a hard time for the small stature of her Felt DA triathlon bike with 650cm wheels.

American triathlete Tim O'Donnell will focus on the Ironman World Championship in 2011.

All3sports, Inc. has signed a deal with American Tim O'Donnell.

Germany’s Michael Raelert became the first athlete to repeat on the Clearwater course, while Great Britain’s Jodie Swallow led the women’s race from start to finish to take her first Ironman World Championship 70.3 title.

The 2010 men's Clearwater field features a mix of fresh faces and veterans, all looking to dethrone Germany's Michael Raelert.

Triathlete.com caught up with Tim O’Donnell to talk about a new partnership with a veterans organization, his plans to jump up to the iron distance and what it will take to win this weekend in Clearwater.