The Marathon Myth: When Running 42.2km Isn’t Always a Healthy Choice

There’s something undeniably inspiring about a marathon. The sheer determination of thousands of runners, the electric atmosphere, the sense of achievement—it’s enough to make anyone lace up their sneakers and dream of crossing that finish line. But here’s the uncomfortable truth: for some, that 42.2km stretch isn’t just a test of endurance; it’s a gamble with their heart.

Personally, I think the narrative around marathons often oversimplifies the risks. We’re told that running is universally healthy, that more miles equal more benefits. And while that’s largely true, it’s not the whole story. Take the Sydney Marathon, for instance. With over 40,000 participants this year, it’s a testament to the sport’s growing popularity. But what many people don’t realize is that hidden heart conditions, coupled with inadequate preparation, can turn this celebratory event into a tragedy.

One thing that immediately stands out is the statistic from Professor Jason Kovacic of the Victor Chang Cardiac Research Institute: sudden cardiac death during a marathon, though rare, is overwhelmingly linked to underlying cardiovascular disease. This raises a deeper question: how many of us truly know the state of our hearts before we hit the pavement? In a culture that glorifies pushing limits, the line between healthy ambition and dangerous overreach can blur dangerously.

What makes this particularly fascinating is the paradox of the ‘athlete’s heart.’ Over time, the heart adapts to endurance training by enlarging, allowing it to pump blood more efficiently. But here’s the catch: this healthy adaptation can look eerily similar to a diseased heart on initial scans. Specialists can distinguish the two, but for the average runner, this nuance is often overlooked. If you take a step back and think about it, this highlights the importance of medical assessments before embarking on such intense physical challenges.

From my perspective, the surge in marathon participation—not just in Sydney but globally—is both encouraging and concerning. Running is now one of Australia’s most popular activities, with 3.5 million adults lacing up their shoes regularly. But as the numbers grow, so does the potential for harm. The Gold Coast Marathon, for example, saw a 10% increase in participants this year. While most will finish with a sense of triumph, a handful may face life-threatening emergencies.

A detail that I find especially interesting is the gender dynamics in marathon running. While more women are taking up the sport, men still dominate marathon fields at 68%. This isn’t just a trivia point—it matters because men are statistically more prone to sudden cardiac events. Combine that with the ‘I’ll just give it a crack’ attitude some runners adopt, and you have a recipe for disaster.

What this really suggests is that the marathon boom isn’t just a fitness trend; it’s a public health issue. The benefits of running are undeniable—improved cardiovascular health, mental well-being, and longevity. But the risks, though small, are real. Professor André La Gerche puts it perfectly: ‘The biggest bang for your health buck is going from unfit to moderately fit.’ In other words, you don’t need to run a marathon to reap the rewards of exercise.

If you’re over 40 or have risk factors like diabetes, smoking, or high blood pressure, a check-up before training isn’t just advisable—it’s essential. Warning signs like chest pain or unexplained shortness of breath should never be ignored. Yet, in the rush to join the marathon craze, these precautions are often overlooked.

Here’s where I diverge from the conventional wisdom: running isn’t the only path to a healthy heart. Cycling, swimming, strength training—any activity you enjoy and can sustain long-term is just as effective. The key is consistency, not extremes. As Professor Kovacic notes, ‘Whatever gets them out of bed at 5:30 in the morning’ is the best choice.

If the Sydney Marathon has inspired you to take up running, my advice is simple: don’t rush it. With less than a month to go, now is not the time to sign up. Instead, set your sights on next year’s event. Give your body—and your heart—the time it needs to prepare.

In my opinion, the marathon isn’t just a race; it’s a metaphor for life. It’s about pacing yourself, knowing your limits, and respecting your body. So, before you join the throngs at the starting line, ask yourself: am I truly ready? Because when it comes to your heart, there are no shortcuts—only smart choices.