Sports
Cheating in Triathlon: Can You Cut the Ironman Course?
Roberto Abrahao of Um Golpe por Milha details the challenges of auditing triathlons and how easy it is to alter Strava data.
In an interview on Café com Tri, Roberto Abrahao examines where cheating loopholes exist across the three triathlon disciplines. The creator of the Um Golpe por Milha project explains how he addressed a false positive at Ironman Florianópolis and warns against GPS file manipulation.
Unlike traditional road running races, where winding urban courses and turnaround points make cutting corners easier, triathlon introduces a unique dynamic when auditing race times and preserving competitive integrity. On Café com Tri, a podcast from the Stemma Sports ecosystem, Roberto Abrahao—the creator behind the Um Golpe por Milha project—discussed how feasible cheating really is across all three disciplines and shared the behind-the-scenes reality of his long-course auditing work.
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Swim, bike, and run: where are the loopholes?
Cutting the course in a triathlon is not straightforward across every leg. In the swim, taking a shortcut by rounding a buoy early or slicing through the designated line is nearly impossible without immediately drawing the attention of kayak staff, race marshals, or neighboring athletes. The only theoretical loophole would arise in multi-lap courses if someone chose to wait near a turn buoy to skip an entire loop—a highly improbable scenario under strict visual oversight.
On the bike leg, continuous flow and the strategic placement of timing mats make physical shortcuts rare, though other issues that are difficult to detect through raw data alone, such as illegal drafting, do arise. The run leg, meanwhile, remains the most vulnerable segment. With courses frequently broken into multiple short loops and out-and-back sections, bad actors find more opportunities to skip portions of the route if timing mats are not present at every turnaround point.
The false positive case at Ironman Florianópolis
Known for auditing major marathons, Abrahao responded to requests from the triathlon community and ran his algorithms across Ironman Florianópolis. Analyzing a multi-lap course, however, presented an unprecedented technical challenge for the system and resulted in a false positive that required a formal retraction.
After spotting anomalous split times for one competitor, Abrahao published the suspicious data points while withholding the athlete's final time. The athlete promptly reached out to clarify what happened: unsure if he had followed the correct route, he had turned around to ask a race marshal for directions, crossing the exact same timing mat twice in a row. That duplicate pass skewed the mathematical models for that split. Once the route was verified via the athlete's raw training file, Abrahao published a video setting the record straight.
How Strava and Garmin files can be manipulated
Auditing data through fitness apps also demands technical caution. Abrahao warned that both Strava and Garmin can accept manipulated activity files without raising immediate suspicion. Because GPS watches export standard data formats (such as .fit or .gpx files), anyone familiar with file structure can adjust distance, split paces, and heart rate metrics while maintaining internal consistency.
To highlight this vulnerability, Abrahao once created and published a deliberately forged workout on his public profile. In his view, a practical fix for tracking platforms would be to clearly label when an activity was uploaded manually or modified after the fact, similar to how messaging apps tag edited messages.
From traffic cones to the social media era
The conversation also traced how race monitoring and athlete behavior have evolved over time. In the early 2000s, certain Ironman events featured single-lap 26.2-mile marathon courses marked only by traffic cones at turnarounds, with no intermediate timing mats. Despite the ease of cutting the course back then, the motivation to cheat was virtually nonexistent.
Today, the pursuit of social media validation and commercial sponsorships has created artificial incentives to chase results at any cost. This shift has turned post-race data auditing into an essential safeguard for preserving sportsmanship and competitive integrity.
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