In 1967, the Boston Marathon was one of the most prestigious races in the world.
Women were not supposed to run it. But the strange thing was that the Boston Marathon’s rules did not explicitly say women were forbidden. The assumption ran deeper than the written rules: women simply weren’t considered capable of running 26.2 miles.
Kathrine Switzer was twenty years old, studying journalism at Syracuse University and training with the men’s cross-country team.
Her coach, Arnie Briggs, initially shared the conventional belief that women were too fragile for marathon distances. But Switzer kept running. During one training session, she covered the full marathon distance — and then some.
Briggs then changed his mind.
Switzer entered the 1967 Boston Marathon using the name K. V. Switzer, paid the entry fee and was issued bib number 261.
She hadn’t sneaked onto the course. She had officially entered a race that nobody expected a woman to enter. And that exposed something interesting about rules.
Sometimes nobody needs to tell you that you can’t do something. An assumption can become so deeply embedded in a culture that almost everyone behaves as though the rule exists anyway.
"Some of the strongest rules are the ones nobody ever bothered to write down.”
On April 19, 1967, Kathrine Switzer started the Boston Marathon wearing bib number 261.
At first, little happened.
Other runners reportedly welcomed her. But a few miles into the race, her hood slipped back and race official Jock Semple saw that one of the registered runners was a woman. He was furious.
Semple ran toward Switzer and attempted to tear the race number from her clothing while shouting at her to leave the race.
The moment might have ended very differently if Switzer had been alone.
Her coach Arnie Briggs tried to intervene. Then Switzer’s boyfriend, Tom Miller, a former football player and hammer thrower running alongside her, knocked Semple away.
Photographers captured the confrontation. Those photographs would become some of the most famous images in the history of women’s sport.
Switzer did not fade into obscurity after 1967. The incident gave her a larger platform — and she used it.
She campaigned for women to be officially admitted to the Boston Marathon. After years of pressure, women were finally accepted as official entrants in 1972.
But Switzer understood that changing one race wasn’t enough. She began advocating internationally for women’s distance running, helping organise events that demonstrated something the old assumptions had denied: women not only wanted to compete, they were perfectly capable of doing so.
The movement continued to grow. In 1984, the women’s marathon was finally added to the Olympic Games.
What had once been dismissed as inappropriate, dangerous or simply unthinkable had become an Olympic event.
"The women hadn't changed. The rule had."
Switzer did not fade into obscurity after 1967. The incident gave her a larger platform — and she used it.
She campaigned for women to be officially admitted to the Boston Marathon. After years of pressure, women were finally accepted as official entrants in 1972.
But Switzer understood that changing one race wasn’t enough. She began advocating internationally for women’s distance running, helping organise events that demonstrated something the old assumptions had denied: women not only wanted to compete, they were perfectly capable of doing so.
The movement continued to grow. In 1984, the women’s marathon was finally added to the Olympic Games.
What had once been dismissed as inappropriate, dangerous or simply unthinkable had become an Olympic event.
Over time, Switzer’s race number — 261 — became something larger than a bib. Women began writing the number on their arms, pinning it to their shirts and even tattooing it on their bodies as a symbol of determination.
Switzer embraced what it had come to represent. In 2015, she founded 261 Fearless, a non-profit organisation encouraging women around the world to overcome barriers through running.
Fifty years after her historic run, Switzer returned to the Boston Marathon wearing number 261.
This time, more than 13,000 women were running alongside her.
The contrast was extraordinary. In 1967, officials had tried to physically remove one woman from the race. Fifty years later, women made up nearly half the field.
What had once seemed like an unquestionable tradition had become almost impossible to imagine.
Kathrine Switzer’s story is not simply about athletic courage. It is a case study in how unwritten rules survive.
She hadn’t broken the entry rules. She submitted the paperwork, paid the fee and entered using her initials, just as she normally did. Yet the moment officials realized a woman was running, the unwritten rule suddenly became visible.
Women weren’t supposed to be there.
And when Switzer challenged that assumption simply by continuing to run, the system responded by turning the unwritten rule into an official one.
That’s what makes this story so revealing.
Sometimes institutions don’t defend rules because those rules make sense. They defend them because the rules preserve an existing way of thinking.
But Switzer’s story also shows how quickly supposedly permanent rules can begin to collapse once somebody forces us to question them.
Even people who once accepted the old assumptions changed. Her coach Arnie Briggs initially doubted that women could run marathon distances. Jock Semple, the official who tried to remove her from the race, later reconciled with Switzer.
The people changed because the assumption had finally been exposed.
nobody ever bothered to write down.”
When Jock Semple grabbed Kathrine Switzer and tried to tear the number from her chest, she was frightened, humiliated and briefly considered quitting. But she kept running.
That simple decision ultimately became more powerful than the confrontation itself.
Because every unwritten rule depends, to some extent, on people continuing to cooperate with it :
- Someone has to be the first person to ask why.
- Someone has to be the first person to look ridiculous.
- Someone has to be the first person told they don’t belong.
And sometimes … someone simply has to keep running.
Switzer didn’t destroy the old assumption in one afternoon. But she made it visible. Once millions of people could see the absurdity of physically trying to remove a capable woman from a marathon simply because she was a woman, defending the old rule became much harder.
That is the larger lesson of her story.
The rules surrounding our own lives may be less dramatic. They might involve careers, age, education, relationships, status or what we’re supposedly capable of doing.
But the question is remarkably similar :
"Are we following the rule because it makes sense — or simply because nobody before us thought to challenge it?"
If this story inspired you to question the rules that hold you back, you’ll find more rule‑breaking stories and practical tools in our NoRuleBook eBook. Learn how thinkers, creators and activists across history have challenged conventions, and discover how you can apply these lessons to your own life. Click the NoRuleBook image below to grab your copy and join a community of fearless rule breakers.
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