Running a half-marathon is challenging enough on its own.
But imagine completing one while wearing 137 T-shirts that weigh nearly 50 pounds and make it impossible to lift your arms to your face.
Idaho’s David Rush did exactly that, earning himself a new Guinness World Record for most T-shirts worn during a half-marathon—and proving that some athletes take layering to extreme new heights.
His journey to breaking this unusual record involved years of attempts, medical risks, and training that looked more like winter survival preparation than race prep.
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Running Like a Human Potato
On May 17, Rush completed the Famous Idaho Potato Marathon half-marathon in Boise, Idaho, finishing in 2:51:44 while bundled in 137 T-shirts. The time officially secured his world record, as Guinness requires completion under three hours.
This wasn’t Rush’s first rodeo with textile overload. Back in 2022, he set the original record at the same race wearing 111 T-shirts. Another runner later claimed the title with 127 shirts, motivating Rush to reclaim his crown.
When Ambition Meets Circulation Problems
Rush’s path to 137 shirts wasn’t straightforward. His 2024 attempt ended in abandonment after just 114 T-shirts cut off circulation to his neck.
I first attempted [to break the record] in May of 2024. But when I got 114 T-shirts on that year, I lost circulation in my neck and had to abandon the attempt.
Learning from that experience, Rush adjusted his strategy for 2025 by incorporating more 6 XL T-shirts into his layers. The larger sizes provided better distribution and reduced dangerous compression around vital areas.
Still, success came with significant physical challenges.
The Physical Reality of 48 Pounds of Cotton
Rush’s 137-shirt ensemble weighed 48 pounds—roughly equivalent to carrying a six-year-old child for 13.1 miles. But weight was only part of the equation.
The shirts weighed 48 pounds. With 137 layers of fabric between my arms and sides, not only could I not feed myself or drink water myself, since my hands couldn’t reach my face, shoulder separation was also a concern.
Rush lost circulation in his hands during the run. He battled overheating despite external temperatures. Claustrophobia became a psychological hurdle as fabric compressed around him.
Shoulder separation presented a real injury risk with so much material forcing his arms away from his body. Basic race necessities like hydration and nutrition required assistance from support crew members.
Training for the Absurd
Preparing for such an unconventional challenge required unconventional methods. Rush couldn’t train in 137 actual T-shirts, so he improvised a system that replicated the conditions.
His training runs included multiple layers of shirts, fleeces, rain jackets to trap moisture and heat, flannel, winter coats, hats, and gloves. He added 35 to 50 pounds in a backpack to simulate the weight.
Then he’d run.
Rush can put on approximately 40 T-shirts independently. Beyond that threshold, he needed a team of assistants to help layer the remaining 97 shirts before race start.
A Serial Record Breaker’s Latest Achievement
The T-shirt half-marathon represents just one entry in Rush’s extraordinary collection. He’s broken more than 350 Guinness World Records in his lifetime, with over 150 coming since 2022 alone.
His most recent achievement before the T-shirt record? On November 10, Rush set the record for most bowling balls held simultaneously while riding a unicycle—seven bowling balls, to be exact.
Guinness World Records describes him simply as “a serial record breaker,” which might be the understatement of the century.
Why Push Physical Limits This Way?
Records like Rush’s might seem frivolous on the surface, but they demonstrate remarkable dedication, creativity, and mental toughness. Completing a half-marathon under any circumstances requires cardiovascular fitness and endurance.
Adding 48 pounds of restrictive clothing transforms the challenge entirely. Rush had to maintain running form while unable to swing his arms naturally. He regulated body temperature without normal cooling mechanisms. He pushed through discomfort that would cause most people to quit immediately.
These attempts also require meticulous planning. Rush spent a full year analyzing what went wrong in 2024, sourcing different shirt sizes, and modifying his approach. He coordinated support teams and trained consistently despite the absurdity of the preparation.
Lessons From Extreme Endurance
While most runners won’t attempt anything close to 137 T-shirts, Rush’s journey offers applicable insights for anyone tackling difficult goals.
Failure provides data. His 2024 neck circulation issue wasn’t the end—it was information that guided his successful 2025 strategy.
Preparation matters more than talent. Rush trained specifically for conditions he’d face, creating simulations that prepared his body and mind.
Support systems enable achievement. He couldn’t have completed this record alone, requiring teams for both preparation and race-day execution.
Mental resilience outweighs physical discomfort. Pushing through claustrophobia, circulation loss, and inability to perform basic self-care demanded psychological strength beyond fitness.
What’s Next for Record Rush?
With 350-plus records already in the books, Rush shows no signs of slowing down. His eclectic portfolio—from T-shirt marathons to unicycle bowling—suggests he’s constantly seeking new frontiers of human capability.
Whether someone will challenge his 137-shirt record remains to be seen. Breaking it would require completing a half-marathon in under three hours while wearing at least 138 T-shirts—and surviving the physical consequences.
For now, Rush holds the title as running’s most layered athlete, proving that sometimes the path to greatness involves making yourself as uncomfortable as humanly possible and running 13.1 miles anyway.
