Even for mega sports fans, the two-time world champion triathlete Siri Lindley might not be on their radar.

However, her story — a tale of resilience and the power of determination — is worth hearing (and viewing).

This weekend, Boulder International Film Festival attendees will get the chance to learn all about the Boulder resident with the new documentary film, “Tri Me: The Siri Lindley Story.” They can see the athlete in person, too, as Lindley will be present at the screening, which takes place at 1:30 p.m. Sunday at Grace Commons, 1820 15th St., Boulder.

Directed and edited by Michael Mazzanti, “Tri Me” celebrates the life of its subject, 55-year-old Lindley. Much of it is edited as a sports documentary. At many points throughout the film, inspirational music swells as we watch Lindley pull ahead of her competitors, her face filled with exertion as she runs toward finish line after finish line.

Lindley started swimming, biking and running in triathlons when she was 23 years old. The documentary uses news coverage of her races to show her competing in triathlons around the world during the 1990s. When she finally makes it to the podium, in the film, the viewer can feel palpable joy, too.

For most of the film, Lindley talks to the audience while sitting in front of a window overlooking the Boulder’s Flatirons. Boulder County viewers of the film will enjoy Lindley’s ties to the area, as she moved to Boulder early in her career. Throughout the documentary, sports commentators announce to everyone that she’s the girl from Boulder, Colorado.

Near the beginning of the film, Lindley’s diagnosis of acute myeloid leukemia is tackled. She was given only a 10% chance of survival at the time of her diagnosis. Using video footage that was recorded one week after her diagnosis in 2019, Lindley tells viewers the news in her own words.“I don’t want you to feel sad for me, I don’t want you to pity me,” Lindley said, talking to her camera.

She’s emotional, but her resolve can be heard.

“I am going to make this my most beautiful victory,” Lindley said.

Lindley’s voice-over throughout the documentary functions like a motivational speech. Since she’s a triathlon coach, she talks to the viewer like she’s their personal trainer, encouraging them to dream big. Some of her narration is also paired with watercolor illustrations, which provide a nice contrast to the newsreels and interviews that guide the film.

Footage of Lindley’s former races is placed next to clips of Lindley working out and living her life in the present. As we see Lindley’s past intercut with her present, viewers get close to glimpsing a full picture of this remarkable person. Viewers can see that she leads equine healing events at her ranch. She dances when she’s happy. She loves running with her wife.

The documentary also interviews other triathletes, touching upon why they do endurance sports. Many of them reveal that it’s more of a mental aspect than a physical one, and as Lindley puts it: The question they ask themselves is, “How hard can I push?”

For viewers who only have a passing knowledge of triathlons, they’ll learn a lot about the sport — why the swimming leg is so hard, how a good transition can make or break a race and more.

Lindley’s story portrayed in “Tri Me” is inspiring — not just because of the races she wins, but because of the connections she forms with the people around her. She commits to repairing and rebuilding relationships with estranged family members, including her sister and her dad.

She braves her cancer treatment with support from her mom and her wife. The film shows that it’s easy to be blown away by Lindley as a person, just as much as by her world-class athleticism.